A 2.00-kg ball has zero kinetic and potential energy.Ernie drops the ball into a 10.0-m-deep well.Just before the ball hits the bottom,the sum of its kinetic and potential energy is:
A)zero.
B)196 J.
C)-196 J.
D)392 J.

Question

Quizplus · Accepted Answer

The ball has zero kinetic and potential energy at the top of the well. As it falls, it gains kinetic energy and loses potential energy. Just before it hits the bottom, it has reached its maximum kinetic energy and zero potential energy. Therefore, the sum of its kinetic and potential energy is zero.

A 200-Kg Ball Has Zero Kinetic and Potential Energy