A body of mass m is thrown at an angle α to the horizontal with initial velocity v 0 . Find the mean power imparted by gravity over the whole time of motion of body and the instantaneous power of gravity as a function of time.
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over whole time of motion 
Because for half cycle work done by gravity is negative and for rest of half is positive.
So total work done by gravity during projectile motion on the body is zero.
Hence 
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