A 17.9 kg block is dragged over a rough, horizontal surface by a constant force of 111 N acting at an angle of angle 31.1◦above the horizontal. The block is displaced 60 m and the coefficient of kinetic friction is 0.152. Find the work done by the 111 N force. The acceleration of gravity is 9.8 m/s2 .Answer in units of J. Find the magnitude of the work done by the force of friction. Answer in units of J What is the sign of the work done by the frictional force? 1. positive 2. negative 3. zero Find the work done by the normal force. Answer in units of J What is the net work done on the block? Answer in units of J.

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