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1. A cord is used to lower vertically a block of mass M a distance d at a constant downward acceleration of g/4. (a) Find the work done by the cord on the block. (b) Find the work done by the work of gravity. 2. A child pulls a 5.6 kg box a distance of 12 m along a horizontal surface at a constant speed. What work does the child do on the box if the coefficient of kinetic friction is 0.20 and the cord makes an angle of 450 with the horizontal