a child is sitting on a swing .its minimum and maximum heights from the ground are 0.75m and 2m resp. its maximum speed will be
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Expert's answer
2012-12-19T10:54:19-0500
T - kinetic energy U - potential energy The Law of Conservation of Energy: T+U = const U = mgh T = (mv^2)/2 T_max+U_min = 0 + U_max (m*(v_max)^2)/2 = mg(h_max - h_min) v_max = sqrt(2g(h_max - h_min) = sqrt(2*10*1.25) = sqrt(25) = 5 m/s
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