Three objects with masses m1= 2.0 kg, m2= 4.0 kg, and m3= 6.0 kg, respectively, are attached by strings over frictionless pulleys as indicated in the figure. Assume the coefficient of kinetic friction between m2 and the tabletop is 0.25 and the system is released from rest. What is the speed of m3 after it falls 1.5 m?

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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.