Question

An 30 kg object from rest was pulled horizontally by a pulling force 100 N applied along the direction of displacement line. The coefficient of kinetic friction between the surface and the object is 0.20 and the object was displaced at a distance of 40 meters. How much power consumed during the travel?

Answer 1

$$W=(F-\mu mg)d\\W=(100-0.2(9.8)(30))40=1650\ J$$