When a block is suspended from a vertically hanging spring, it stretches the spring from its original length of 4.50 cm to a total length of x = 5.50 cm. The spring with the same block attached is then placed on a horizontal frictionless surface. The block is pulled so that the spring stretches to a total length of y = 7.28 cm; then the block is released, and it oscillates back and forth. What is the maximum speed of the block as it oscillates?

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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.