Hi,
A ball thrown in the air has the highest potential energy when it is at the top of its trajectory, because it is at the point at which it has maximum vertical height and its vertical velocity is 0 (its not moving up or down at that point)
Hope this helps,
Jeron
Answer: When the ball reaches the highest point and stops briefly.
Explanation: All thrown projectiles make a parabola, the peak of the parabola will have the greatest gravitational potential energy.
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