A child on a sled starts from rest at the top of a 20.0° frictionless slope that is 100m long. What is the child's speed at the bottom of the slope?   A) 26 m/s   B) 90 m/s   C) 11 m/s   D) 47 m/s   E) 34 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.