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    				| 1. | 29. Aboy is sitting on a swing at a maximum height of 5m above the ground. When the swing passes throughthe mean position which is 2m above the ground its velocity is approximately-(1) 7.6 m/sec(2) 9.8 m/sec(3) 6.26 m/sec(4) of these40. Th | 
| Answer» The law of conservation of energy states that the total amount ofenergy inan isolated system remains constant over time.At a maximum height:K0 =0P0 = m * g * HAt a lowest point:K1 = m * V^2 / 2P1 = m * g *h K0 + P0 = K1 + P1, so:m * g * H = m * V^2 / 2 + m * g * hg * H= V^2 / 2 + g * hV^2 / 2 = g * H - g * hV = sqrt(2 * g * (H - h))V =sqrt(2 * 9.81 * (5 - 2)) = 7.67 m/s | |