A father exerts a 2.40-10 2 N force to pull a sled with his daughter on it (combined mass of 85.0 kg) across a horizontal surface. The rope with which he pulls the sled makes an angle of 20.0° with the horizontal. The coefficient of kinetic friction is 0.200, and the sled moves a distance of 8.00 m. Find
a) the work done by the father,
b) the work done by the friction force, and
c) the total work done by all the forces.
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