A 50 kg girl is swinging onn a swing from rest.then the power delivered when she was moving with a velocity of 2 m/s upwards in a direction making an angle 60 degrees with the vertical is-
We have to consider power delivered by gravity. Now, gravity acts in vertical direction. Therefore, we have to consider the velocity in vertical direction only. So, 2cos60 = 1. Power=force x vel = 50 x 9.8 x 1 = 490 W
Moderation Team
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