A 2.0-kg mass is attached to a vertical spring. The mass is held in place with the spring relaxed, and then released from rest. As the mass falls, it stretches the spring. If the spring has a force constant of 100 N/m, how fast is the mass moving after is has descended 3.0 cm? Ignore air resistance.

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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.