Two boxes are attached together by a rope which extends over a pulley where one box is suspended in the air and the other is on a ramp which has an angle of elevation of 40°. There is a coefficient of friction of 0.750 between the box and the ramp and the initial velocity of the boxes is 0 m/s. If the box on the ramp has a mass of 15.0 kg and is 5.00 m from the end of the ramp and the box suspended in the air has a mass of 20.0 kg and is 2.00 m off the ground, how long does it take one of the boxes to touch the ground?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.