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Question

(A) According to the Law of Conservation of Energy,the total mechanical energy of an object remains constant in the absence of air resistance.At the m

Vedclass · Accepted Answer

$mgh$

Vedclass · Answer

(A) According to the Law of Conservation of Energy,the total mechanical energy of an object remains constant in the absence of air resistance.At the maximum height $h$,the ball possesses potential energy equal to $mgh$ and its kinetic energy is $0$.As the ball falls,its potential energy is converted into kinetic energy.Just before touching the ground,the entire potential energy is converted into kinetic energy.Therefore,the kinetic energy of the ball just before touching the ground is equal to $mgh$.

When a ball is lifted to a height of $h$ and then dropped,what is the kinetic energy of the ball just before it touches the ground?

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