You do work on a body when you lift it against gravity. How does this work relate to gravitational potential energy? If the lifted body is dropped, what becomes of this energy?
What will be an ideal response?
The work you do on the lifted body may be stored as gravitational potential energy. Then the force × the distance = the weight × height. If the lifted object is dropped, this energy transforms to motion energy—kinetic energy. The kinetic energy it has as it returns to its initial position equals the gravitational potential energy at its highest point, which equals the work done in the first place.
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