A girl of mass 50 kg sits in a swing formed by a rope of 10 m length.A person pulls the swing to a side so that rope makes an angle of 60 with the vertical.What is the gain in potential energy of the girl? Share with your friends Share 6 Ved Prakash Lakhera answered this When swing is pulled apart the vertical height of the swing h= 10 cos60°=10/2 =5m.therefore the height by which the swing is raised = l-h = 10-5 = 5m.therefore the rise in the potential energy =mgh = 50×10×5= 2500 J. 12 View Full Answer
