Physics High School

9. An object moving at a constant velocity accelerates at a constant rate of 20 m/s for a distance of
100 m. At the end of the acceleration the object has a velocity of 80 m/s. What was its velocity
before accelerating?

9. An Object Moving At A Constant Velocity Accelerates At A Constant Rate Of 20 M/s For A Distance Of100

Answers

Answer 1

Answer:

I believe the answer is roughly 49m/s

Explanation:

List all given variables:

Accel=20m/s^2

Dist=100m

Final velocity=80m/s

Initial velocity=?

Using the equation i=sqrt(f^2-2a*d) where i =initial velocity, f=final velocity, a=acceleration, and d=distance, we can plug in the known values and solve for initial velocity

i=sqrt(80^2-2*20*100)

i=sqrt(6400-4000)

i=sqrt(2400)

i=48.99, rounded up to 49m/s as the initial velocity

This is my speculation about this answer would appreciate if anyone can confirm this.

Related Questions

LOGARITHMIC functions have 2 asymptotes
True
False

Answers

Answer:

true

Explanation:

true

Cardiovascular fitness measures the health of which body system?

Answers

Answer:

I believe it is the circulatory system.

Explanation:

Have a nice day.

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Answers

Answer:

the answer is B

Explanation:

because i had this question in 8th grade

2. If Peter is traveling .25 m/s on his bike, how long will it take him to reach
a fence that is 12 meters away?
a. 3 s
b. 20 s
c. 12 s
d. 48 s

Answers

Answer:

48 seconds

Explanation:

Since S=d/t, plug in the known values and solve

0.25m/s=12m/t

0.25m/s*t=12m

t=12m/0.25m/s

t=48 seconds

the answer is A. 3 s

This is because the equation states 0.25 meters/ seconds.

We can rewrite this as 0.25m. M =meters. They asked for 12 meters so we do 0.25 x 12 = 3

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Question: If you are traveling by train and the trip is 125 miles and takes 2 hours winding through the mountains, a) whats average speed? b) how would this be different if the train in each of the following situations- Train at rest, Train traveling at constant speed in a straight line, and the Train with a braking force (the train in the middle of coming to a stop)

PLEASE ANSWER ALL ASAP

Answers

Answer:

Average speed 62.5 miles an hour.  If the train was traveling at a constant speed in a straight line it would be much faster on getting to its destination

Explanation:

Please do all of i will give you brainlest and thanks to best answer

Answers

Answer:the answer is A

Explanation:

A liquid has a density of 0.85 g/cm. If you pour some of the liquid into a glass of water, will the liquid float?
Explain how you know
PLEASE HURRY

Answers

Answer:

Yes, it will float.

Explanation:

It is given that,

A liquid has a density of 0.85 g/cm³.

We know that, the density of water is 1 g/cm³.

The density of the liquid is less than that of water. If the density of the liquid is less than that of water, it will float in it. Hence, if you pour some of the liquid into a glass of water, it will float.

Where is the planet moving faster?

Answers

Do you mean what planets moves the fastest?

Why does jake get shocked when he touches the top on the plastic slide but Jacob doesn’t get shocked when he touches the underside?

Answers

Answer:

Physics and sun. BOOM

Answer: As you slide down the plastic slide, electrons move from the plastic to you. Now you have extra electrons. Touch another person or an object (anything that isn't negatively charged by extra electrons) and ZAP!

technically, since no one is sliding down the other side of the slide there aren't any extra electrons being made, so you can't really get shocked.

Formulas
Speed = distance / time
Time = distance / speed
Distance = speed x time
A bowling ball rolls 30 meters in 4 seconds. What speed did it travel?
distance = 30m
time = 45
speed = ?

Answers

Using s= d/t

7.5 m per second

Speed = distance/time
= 30/45
= 6/9
= 2/3
= 0.666.........
Speed = 0.6

The movement of crustal plates is best described as a:
1)Trend toward increased crust movement overtime
2)Series of events that happens quickly
3)continuing long-term process
4)process that has a predictable pattern

Answers

Я в России не будет так классно было в прошлом и настоящем человеке и в России в г щеки как у щ есть и в этом случае не знаю что это не так как в России не ебыло щит и не кзнаю в контакте г не знаю почему так мало ее и не только в России не будет в России не щ и не только в щтом г

Answer:

it is number 3, continuing long-term process

1. What is responsible for the different phases of matter?
2. What is the temperature at which a substance changes from a liquid to a solid?
3. What is the phase change from a gas to a liquid?
4. What is the phase change from a solid directly to a gas?

Answers

Answer:

1. The five phases of matter. There are four natural states of matter: Solids, liquids, gases and plasma. The fifth state is the man-made Bose-Einstein condensates. In a solid, particles are packed tightly together so they don't move much.

2. The temperature at which a substance changes from the liq- uid state to the solid state is called the freezing point. The freez- ing point of the liquid state of a substance is the same temperature as the melting point of the solid state. For example, solid water melts at 0°C and liquid water freezes at 0°C.

3. The process of a liquid becoming a gas is called boiling (or vapourization), while the process of a gas becoming a liquid is called condensation. 4. Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.

Explanation:

hi

if you punch a wall with the force of 30N, what force will you feel on your fist

Answers

30N

Natural reaction, the same force comes back to you

Answer:

it depends on if collision elastic or in elastic

if collision is elastic the the wall will also exert 30 N

Electromagnetic waves are sometimes demonstrated by rippling waves in water. However, electromagnetic waves are different from water waves. Which is a
characteristic that makes electromagnetic waves and water waves different?
O A. All water waves have higher frequencies.
OB. All water waves have longer wavelengths.
OC. All electromagnetic waves are transverse waves.
O D. All electromagnetic waves can travel in a vacuum.

Answers

The answer is D: all electromagnetic waves can travel in a vacuum
D my teacher had gone over it with us before

Question 14 of 25
If magnetic field lines are drawn to represent a magnetic field, what would
they look like?
A. Only some of the lines form loops.
B. There is no consistent pattern in the lines.
C. The lines extend from the north pole to the south pole of the
magnet.
D. The lines extend from the south pole to the north pole of the
magnet.

Answers

Answer:

c

Explanation:

magnetic lines moves from North to South Pole of a magnet

The magnetic field lines are drawn to represent the start from the north pole to the south pole of the magnet. Therefore, option (C) is correct.

What are magnetic field lines?

The magnetic field can be described as a field generated by the magnet or electric charges in motion. The magnetic field can be defined as the region around a magnetic material within which the force of magnetism acts.

Magnetic fields can be represented using magnetic field lines. Magnetic field lines can be drawn with the help of a compass needle. The tangent can be drawn to the magnetic field lines giving the direction of the magnetic field.

Magnetic field lines appeared to emerge from the north pole and merge at the south pole. The direction of the magnetic field lines is from the south pole to the north pole inside the magnet.

Magnetic field lines never intersect and form a closed loop. Field lines have both magnitude and direction so they are represented by a vector.

Learn more about Magnetic field lines, here:

https://brainly.com/question/17011493

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Ram travel 50metre on a straight road in 30second . hari covers the same distance on the same road in 45s . who has done more work ? who has more ? Explain in short​

Answers

Answer:

The ram has done more work because the rate at which the ram work is 1.6m/s and Hari is 1.1m/s

what is the kinetic energy of a 1 kilogram ball thrown into the air with an initial velocity of 30 m/s

Answers

Explanation:

KE = 1/2 MV ^2

KE = 1/2 * 1 * 30 ^2

KE= 1/2 * 1 * 900

KE = 450 kg m^2/ s^2

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Answer:

the above pic will help

I have done it in word

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When thermal energy is added to an object, what happens to the motion of the particles?

A.
increases

B.
decreases

C.
remains unchanged

D.
decreases, then increases

Answers

The answer is A

Explanation:

HELP ASAP!!!

All atoms of the same element have the same number of
a. electrons b. protons
c. neutrons
d. isotopes

Answers

Answer:

The answer is b.Protons



If a ball is thrown at a wall at 3 m/s (with NO air resistance), with what velocity will it
hit the wall?

Answers

Answer:

3 m/s

Explanation:

have a good day

A velocity-time graph shows how what changes over time.

Answers

Answer:

velocity changes over time.

Guys i need help please

Answers

Answer:

I'm pretty sure the answer is around 9.2 seconds

Explanation:

Allison pulls on a refrigerator with 200 N of force. Fred helps
her out and pulls on the refrigerator in the same direction with
300 N of force. What is the net force on the refrigerator?
N

Answers

Answer:500

Explanation:

If two forces are acting on an object in the same  direction, then they will add up and the net force will be the sum of their magnitudes. Thus, the net force on refrigerator is 500 N.

What is force?

Force is an external agent acting on a body to deform it or to change it form the state of rest or motion. There are various kinds of forces, such as gravitational force, frictional force, magnetic force etc.

If two forces are acting on a on an object in the same  direction, then they will add up and the net force will be the sum of their magnitudes. If they are acting from the opposite directions, they will cancel each other in magnitude and and the net force will be the subtracted value.

Here, both Allison and fred pulls the refrigerator from the same direction and the net force is the sum of  forces by each person. Therefore, the net force here is 300 + 200 = 500 N.

To find more on net force, refer here:

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Question 6 (10 points)
The Washington Monument in our nation's capital is 555 ft high. Neglecting the effects of air resistance, what would be the
speed of the penny as it "hit" the ground?
оа
Ob
Oc
Od
48.3 m/s
-68.4 m/s
84.7 m/s
-57.6 m/s

Answers

Answer:

a= g = - 9.81 m/s2.

The following equations will be helpful:

a = (vf - vo)/t d = vot + 1/2 at2 vf2 = vo2 + 2ad

When you substitute the specific acceleration due to gravity (g), the equations are as follows:

g = (vf - vo)/t d = vot + 1/2 gt2 vf2 = vo2 + 2gd

If the object is dropped from rest, the initial velocity ("vi") is zero. This further simplifies the equations to these:

g = vf /t d = 1/2 gt2 vf2 = 2gd

The sign convention that we will use for direction is this: "down" is the negative direction. If you are given a velocity such as -5.0 m/s, we will assume that the direction of the velocity vector is down. Also if you are told that an object falls with a velocity of 5.0 m/s, you would substitute -5.0 m/s in your equations. The sign convention would also apply to the acceleration due to gravity as shown above. The direction of the acceleration vector is down (-9.81 m/s2) because the gravitational force causing the acceleration is directed downward.

hope this info helps you out!

plzzzz help it for civics

Answers

Answer:

A : the colonists dumped tea in Boston Harbor

a roller coaster begins at the top of a hill if it acelerates at the rate of 2 m/s2 and has a mass of 2000 kg what net force is acting on it plzzz someone help im over here crying bc i dont know

Answers

Answer:

[tex]\boxed {\boxed {\sf 4000 \ Newtons }}[/tex]

Explanation:

Force can be found by multiplying the mass by the acceleration.

[tex]F=m*a[/tex]

The mass of the roller coaster is 2000 kilograms and the acceleration is 2 meters per second squared.

[tex]m= 2000 \ kg \\a= 2 \ m/s^2[/tex]

Substitute the values into the formula.

[tex]F= 2000 \ kg * 2 \ m/s^2[/tex]

Multiply.

[tex]F= 4000 \ kg*m/s^2[/tex]

1 kg*m/s² is equal to 1 NTherefore our answer of 4000 kg*m/s² is equal to 4000 Newtons

[tex]F= 4000 \ N[/tex]

The net force acting on the roller coaster is 4000 Newtons.

Choose ne
1. Water is optically rarer than_____
a. glass
b. air
c. diamond
d. both b and c
​

Answers

Answer:

diamond

Explanation:

im not 100% sure so my bad if im wrong

please help me pwease

Answers

Answer:

Mantle will be the required answer

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Answers

Answer:

B

hdhdududydysgd

hdhdgdtdtdt

gsgdgdggd

Explanation:

I TIHNK IS THE ANSWER

Answer:

C

Explanation:

Wave length is - - - - >

Bsjejwakknsbsbehebebbdbdbs

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plz do it right

Answers

Answer:

d

Explanation:

Answer:

Earth absorbs heat from the sun.

Explanation:

This radiation is absorbed by greenhouse gases which then radiate energy into all directions including downwards and thereby trapping heat in the atmosphere.

Hope you have a good day :)

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He hoped the pioneer family got their wagon wheel fixed soon.Question: Which statement supports the idea that Little Bear is curious about the white settlers?Group of answer choices"Hed never seen white people before, though his father sometimes traded skins and bows with the men.""Little Bear had heard all of the warnings, but he still wanted to see what they looked like.""He hoped the pioneer family got their wagon wheel fixed soon.""Little Bear froze when one pulled out a rifle and fired it into the air."Flag this QuestionQuestion 220 ptsThe Settlers by Rowena Jackson1 Little Bear crept closer through the tall grass until he had a better vantage point to watch the trail of wagons pass. Hed never seen white people before, though his father sometimes traded skins and bows with the men. Little Bear had heard all of the warnings, but he still wanted to see what they looked like.2 One wagon fell behind the rest of the caravan. The rains of the past few days had turned the trail to thick mud, and the wagons oxen were tired. They made it another few minutes before Little Bear heard a loud crack, and the back corner of the wagon crashed to the ground.3 Two people from the wagon inspected the broken wheel. Little Bear froze when one pulled out a rifle and fired it into the air. He crouched into a small ball in the weeds, his heart drumming in his ears. But then he saw other people running to help the stranded travelers, and he knew that the rifle shot had just been a signal.4 Just then, there was a rustle in the grass beside Little Bear. He let out the long breath hed been holding when he saw it was just his older brother, White Deer, who silently signaled that they needed to return home before the settlers spotted them.5 Little Bear followed, but he paused a moment to glance back. Traveling out on the open prairie was dangerous, and the settlers were just people. 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