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A body of mass m is thrown at an angle a...

A body of mass `m` is thrown at an angle `alpha` to the horizontal with the initial velocity `v_0` Find (a) instantaneous power of gravity as a function of time and
(b) mean power developed by gravity in time (i) `t=0` to `T`,
(ii) `t=0` to `(T)/(2)`, (iii) `t=(T)/(2)` to `t=T`, where `T` is the time of flight.

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