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A boy jumps from rest straight upward from a flat stationary concrete surface The boy...

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Physics

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A boy jumps from rest straight upward from a flat stationary concrete surface The boy of mass M leaves the concrete surface with speed u and his centre of mass rises a distance d to the highest point of the motion How much work did the normal force of contact N between the boy s feet and the concrete do the boy A Nd B Mv2 2 C No Nd 4

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