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A body of mass 2 kg is projected at 20 `ms^(-1)` at an angle `60^(@)`above the horizontal. Power due to the gravitational force at its highest point is
A. 200 W
B. `100sqrt3` W
C. 50 W
D. zero

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Correct Answer - D
(d) P=F.v
`=mg(mu cos theta cos 90^(@)=0`
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