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Potential Energy of an Object at a Height

An object is ...

Question

An object is fall freely from a height of 70 m. If the mass of an object is 4 kg. Find the kinetic energy before it strikes the ground.

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Solution

Energy can neither be created nor be destroyed and in this case the potential energy at height will be converted into kinetic energy just above the surface so ,

Potential energy at 70m = kinetic energy attained during fall =mgh= 4×9.8×70 = 2744 joules

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