A 1.5-kg block initially at rest at the top of a 3-m incline with a slope of 30° begins to slide down the incline. The upper half of the incline is frictionless, while the lower half is rough, with a coefficient of kinetic friction μk = 0.3. (a) How fast is the block moving midway along the incline, before entering the rough section?  (b) How fast is the block moving at the bottom of the incline

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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.