Q. A body projected vertically from the earth surface reaches a height equal to earth's radius before returning to the earth. When will be the power exerted by the gravitational force is greatest ?

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At the highest position of the body

At the instant just before the body hits the earth

It remains constant all through

At the instant just after the body is projected

Solution:

Just before hitting the earth θ = 0^o. Hence, the power exerted by the gravitational force is greatest at the instant just before the body hits the earth.

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