Question

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?

Answer 1

Answer:

490 W

Explanation:

power = tension * velocity

P=T×v

T=Fgcosθ=mgcosθ=50×9.8×cos60

v=2m/s

∴P=(50×9.8×cos60)×2

⇒P=490W