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Q.

A girl of mass 50kg swinging on a cradle. If she moves with velocity of 2ms−1 upwards and swing makes an angle 600 with the vertical, then the power generated is (g=9.8ms−2)    

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An Intiative by Sri Chaitanya

a

245 W

b

4902 W

c

980 W

d

4903 W

answer is C.

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Detailed Solution

m=50kg

V=2ms−1

θ=600    g=9.8ms−2

Power=mg sin 600(v)=50(9.8)32(2)=4903 watt

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