In the figure below, the two blocks are released from rest, with the 2.0 kg block at height H above the ground. The coefficient of kinetic friction between the 3.0 kg block and the table on which it is moving is 0.11. What height H must be for the 2.0 kg block to have a speed of magnitude 9.1 m/s just before it hits the ground? Consider g = 10.0 m/s2.

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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.