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A particle of mass m is projected with velocity u at an angle α with horizontal. During the period when particle decends from highest point to the position where its velocity vector makes α/2 angle with horizontal, work done by gravity force is

(a)12mu2tan2α(b)12mu2cos2αtan2α/2(c)12mu2tan2α/2(d)12mu2cos2α/2m2α

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