A 1.80 kg block slides 3 meters on a rough horizontal surface before hitting a spring. When the block hits the spring, it compresses the spring a distance of 15 cm before coming to rest. If the coefficient of kinetic friction between the block and the surface is 0.50 and the spring constant is 250 N/m, what was the speed of the block at the beginning of the 3 meters?

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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.