A 12-kg block is pulled 20 m up the sloping surface of a plane inclined at an angle of 37° to the horizontal, by a constant force P of 120 N acting parallel to the plane. The coefficient of friction between the block and plane is 0.25 . а. What is the work of the force P? b. What is the work done by the friction force? C. What is the work done by gravity? d. What is the total work done on the block? е. Use your answer in (d) to calculate the increase in kinetic energy of the block? f. Compute the increase in potential energy of the block?

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