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Question

A 40 kg girl is swinging on a swing from rest. Then, the power delivered when moving with a velocity of 2 m/s upwards in a direction making an angle 60 with the vertical is

A
2483 W
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B
3923 W
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C
448 W
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D
580 W
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Solution

The correct option is B 3923 W
Two force are acting on bob, tension and weight. Power of tension will be zero and that of weight is,

P = mgv cos(90+θ)
P = mgv cos(90+60)
=mgv. sin60
=40×9.8×2×32=3923 W
Power delivered is 3923 W

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