Question

A kid on a trampoline has 1,000 J of potential energy when they are at the top of a jump. How much kinetic energy will the kid have when they come halfway down?
A. 100 J

B. 250 J

C. 500 J

D. 1000 J

Answer 1

Answer:

C. 500 J

Explanation:

Given;

potential energy of the kids at the top of the trampoline, P.E = 1,000 J

⇒At the top of the trampoline, the kids have only potential energy.

⇒On half way down, the kids have both kinetic energy and potential energy.

⇒At the bottom of the trampoline, the kids have only kinetic energy.

Based on the statements above, the kinetic energy of the kids half way down is calculate as;

P.E +  K.E = 1000 J

Base on law of conservation of energy,  P.E = K.E

2 K.E = 1000 J

K.E = ¹/₂ x 1000 J

K.E = 500 J.