A child pushes an empty swing weighing 840 g and the swing moves through the equilibrium position at a speed of 7.2 km/h. At what height will the centre of gravity of the swing be when it rises to the highest position? The swing is in equilibrium when at rest. In the equilibrium position, the height of the center of gravity is 50 cm. The resistance forces are neglected.
Starting and ending position of the swing
