A kid slides down an icy (frictionless) hill starting from rest. At the top his gravitational potential energy is 500 J.
-He slides all the way down to the valley bottom where his gravitational potential energy becomes zero.His kinetic energy at the bottom will be
A)0 J.
B)500 J.
C)some value between 0 and 500 J.
D)none of the above.

Question

Quizplus · Accepted Answer

In a frictionless system, mechanical energy is conserved. The initial potential energy of 500 J is completely converted into kinetic energy at the bottom, so his kinetic energy will be 500 J.

A Kid Slides Down an Icy (Frictionless) Hill Starting from Rest