Question

A ball thrown vertically upward reaches a certain height and comes down again. What can you say about its kinetic energy at the maximum height?

Answer 1

The maximum height is the point where the ball runs out of gas,
stops rising, starts falling, and it's velocity changes from upward
to downward. At that instant, it has no speed, so its kinetic energy
is zero.

Answer 2

Answer: The kinetic energy of the ball at the maximum height is zero.

Explanation -

As per the question, the ball is moving vertically upwards. Every time it's velocity will decrease and it becomes zero at the maximum height.

Whole of ball's initial kinetic energy is converted into potential energy at maximum height.

Thus we can conclude that the kinetic energy is zero at the maximum height.