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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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a

At the highest position of the body

b

At the instant just before the body hits the earth

c

It remains constant all through

d

At the instant just after the body is projected

answer is B.

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Detailed Solution

Power, P=F→⋅ν→=Fνcos⁡θJust before hitting the earth θ=0o. Hence, the power exerted by the gravitational force is greatest at the instant just before the body hits the earth.
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