1.

A 50 kg girl is swinging on a swing from rest.Then the power delivered when moving witha velocity of 2m/sec upwards in a directionmaking an angle 60 with the vertical is(A) 980W(C) 490 /3 WQ,5(B) 490W(D) 245W

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thanku

please tell me which book claer my concept clearly for such tough problem



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