A body projected vertically from the earth reaches a height equal to ear...

A body projected vertically from the earth reaches a height equal to earth's radius before returning to the earth. The power exerted by the gravitational force is greatest  (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.

AIPMT/NEET 2011 | W.P.E Q 2 | We should know there are three types of Power. Average power , instantaneous power and net power. Here while looking at options we can understand that qus is talking about instantaneous power so we need to focus on dot product of force and velocity at that instant.

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