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When an apple falls from a tree what hap...

When an apple falls from a tree what happens to its gravitational potential energy just as it reaches the ground ? After it strikes the ground ?

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1) Let us imagine an apple of mass 'm' falls from a height h.
2) Before starting to fall down, its velocity is zero. Hence its energy is purely potential.
3) When it falls down, its gravitational potential energy gradually converts into kinetic energy, but the entire enegy in the system remains same.
4) When it strikes the ground, its energy is fully kinetic, till its velocity becomes zero.
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