A skier starts to slide from the 20 m high ramp for the first time without speed and without friction. What is the speed of the boatman at the lower end of the ramp? A) 29 m / s B) 60 m / s C) 20 m / s D) 30 m / s E) 25 m / s

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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.