g A projectile of mass 3 kg is launched horizontally from an initial height 3 m with an initial velocity 10 m/s. This velocity in the x direction is preserved when you ignore air resistance. The projectile still accelerates in the vertical y direction toward the ground, but this is exactly the energy lost from potential energy. Energy is conserved as long as you use the total mechanical energy equation. What is the final kinetic energy as the projectile just reaches the ground

Answers

Answer 1

Answer:

The kinetic energy at ground will be "238.2 J".

Explanation:

The given values are:

mass,

m = 3 kg

Initial height,

h = 3 m

Initial velocity,

v = 10 m/s

By using the conservation of energy at points A and B,

⇒  [tex]E_A=E_B[/tex]

⇒  [tex]mgh+\frac{1}{2}mv^2=k_B[/tex]

On substituting the values, we get

⇒  [tex]3\times 9.8\times 3+\frac{1}{2}\times 3\times (10)^2=k_B[/tex]

⇒             [tex]88.2+0.5\times 3\times 100=k_B[/tex]

⇒                            [tex]88.2+150=k_B[/tex]

⇒                                    [tex]238.2 =k_B[/tex]


Related Questions

A.) A gemstone of mass 1.8 kg compresses a scale's spring by 2.6 cm.
Determine the spring constant.

B.) How much would the spring in the previous question compress if a 5.2 kg mass was placed on the scale?

Answers

Explanation:

Given that,

Mass, m = 1.8 kg

Compression, x = 2.6 cm

We know that,

Force on spring = weight

So,

[tex]mg=kx[/tex]

Where

k is spring constant

[tex]k=\dfrac{mg}{x}\\\\k=\dfrac{1.8\times 9.8}{2.6\times 10^{-2}}\\\\k=678.46\ N/m[/tex]

(2) If m = 5.2 kg

[tex]x=\dfrac{mg}{k}\\\\x=\dfrac{1.8\times 9.8}{678.46}\\\\x=2.6 \ cm[/tex]

Hence, this is the required solution.

1. An atom that loses electrons has a ________________________ charge and an atom that gains
electrons has a ___________________________ charge.
Charged atoms are called ___________________.
2. What is an insulator? Give 4 examples.
3. What is a conductor? Give an example.
4. How can we move electrons from one place to another? What actually causes the electrons to
move?
5. Static electricity is ______________________________________________________________________
_______________________________________________________________________________________
6. Explain the attraction and repulsion of charges.
7. Why does a balloon stick to the wall?
8. Why does your hair stand up when you take off your hat?
9. Why do you get a shock when you walk across a carpet?
10. When is static electricity most noticeable and why?
11. State the Principle of Conservation of Charge.

12. The invisible electric force field around charged objects depends on __________________________,
__________________________, and _____________________________.
13. What is the relationship between the charges and the field strength?
What is the relationship between the field strength and the distance between the charges?
1. What is DC?
What is AC?
2. Name 3 ways to get DC.
3. What is an electrical circuit?
4. What is voltage?
What is current?
What is resistance?
What causes heat and light in a wire?
COPY THE TABLE comparing water in a hose-DC-units
5. Which electricity do we use in our homes?
CLICK ON ALTERNATING CURRENT
1. Explain AC.
2. Who invented the light bulb?
3. Who really invented AC?
4. Who discovered the advantages of AC over DC?
5. How is AC made?
6. What is the main advantage of AC over DC?

Answers

I’ll start you off

1. Positive, negative, ions

Answer a few yourself and I’ll come back and help some more.
Other Questions
Tiffany used to live 15 kilometers away from the school, but after she moved she now lives 9.9 kilometers away. Is this an increase or decrease? Please help ill mark brainlist !!!! The battle of the Gettysburg was significant because...A ) It was an overwhelming Confederate victory.B ) the Union army's advance in the Confederate capital was stopped.C ) It ended Lee's hopes of advancing into northern territory.D ) It enabled the Union to control the Mississippi River. 4Select all the expressions that are equivalent to-2(5x - 1) + 7(5x - 1) 3(-5x + 1)M. -10x 1 + 35x - 1 + 15x + 1P. -10x + 2 + 35x - 7 - 15x - 3R. (5x - 1)(-2 + 7 - 3)S. (5x - 1)(-2 + 7 + 3)T. 40% - 8V. 10x + 2 Which method of payment actually is a form of borrowing money thatneeds to be paid back later?*5 pointsO a. Cashb. Credit CardO c. Debit CardO d. Check I NEED HELP PLEASEEE I WILL MARK BRAINLEIST Europe and United States use geothermal power extensively.TrueFalse what are the elements of a landscape Makayla has $8 to buy tickets at the school fair. Each ticket costs $1.50. Which inequalitybest represents how many tickets she can buy?n = number of tickets PLZZ IF ANYONE KNOWS SCIENCE HELP ME PLZ I this is so confusing :(ill liderally make a question with 50 and a brainliest since you helped me ;-; Please help! you'll get Brainliest if you do! what is the area of the rectangular piece of wood? _______ is a system in which both matter and energy flow into and out of the system. A. A dynamic system B. A closed system C. An isolated system D. An open system What is the most important part of the United Nations?Question 14 options:The War Crimes CouncilThe Office of FinanceThe General AssemblyThe Security Council Please help me with my school work The price of an item has dropped to $98 today Yesterday it was $140. Find the percentage decrease If you know pls tell me How is racism socially constructed in our culture ? You look bad! You look like that scraggly white kid from Disney shows. Your assignment is to discuss in writing at least two techniques you use (or will use or will suggest to others) to help handle mental stress. Include at least two references you use to support your techniques. One reference can be your textbook. **I will do the textbook part** Choose the term that best matches the description given.The act that has its own definition and remedial steps for mistakenly created e-commerce contracts:Pls help me. I will give best answer