A 50 kg girl is swinging on a swing from rest.then the power delivered when moving with a velocity of 2m/s upwards in a direction making an angle 60* with the vertical is?

Refer to the following diagram

We know that in this case

Power = Tension x velocity

or

P = T × v

here,

T = Fgcosθ = mgcosθ = 50 x 9.8 x cos60

v = 2 m/s

so,

P = (50 x 9.8 x cos60) x 2

thus, power will be

P = 490W

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