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Question

Give reasons :
When a body falls freely to the ground, its motion has a uniform acceleration.

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Solution

Gravitational Force acting on the body, F = GMmR2
where M is mass of earth, m is mass of body and R is radius of earth.
Noe, acceleration of the body, a = Fm = GMR2
which is independent of the mass of the body.
Therefore, during free fall, body has unifrom acceleration.

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