Draw a free-body diagram of a block which slides down a frictionless plane having an inclination  of angle = 15.0°. The block starts from rest at the top and the length of the incline is 2.00m. Find: a. the acceleration of the block, b. its speed when it reaches the bottom of the incline, and c. if the block is given an initial velocity of 5.00 m/s up a frictionless 20.0° incline, how far up  the incline does the block slide before coming to rest?

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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.