Question 3
Work, Energy and PowerA stone of mass 1 kg is dropped from a height of 10 m above the ground and falls freely under gravity. Its kinetic energy 5 m above the ground is then equal to
- A.its kinetic energy on the ground
- B.twice its initial potential energy
- C.its initial potential energy
- D.half its initial potential energy
Show the answer and explanation
Answer: D (half its initial potential energy)
Explanation
After falling 5 m of the 10 m, the stone has turned half of its starting potential energy into kinetic energy.