Question

A ball is thrown downward from some height above the ground. At the instant before it reaches the ground, the ball's kinetic energy will be equal to which of the following?

A.its initial kinetic energy

B.its initial potential energy

C.the sum of its initial potential energy and its kinetic energy

D.the difference between its initial potential energy and its kinetic energy

Answer 1

B. It's initial potential energy.

You can verify with the formulas mgh (m - mass, g - accel. due to gravity, h - height) and
`(1)/(2)`
`mv^(2)` (m - mass, v - velocity of object)