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You are sliding down a hill on a sled. You and the sled together are 60...

You are sliding down a hill on a sled. You and the sled together are 60 kg. The hill is 36 m long and is 10 m in height. on the surface just before the hill the sled is moving 6 m/s. when the sled reaches the bottom of the hill, it is moving at 12 m/s.

(a). how much work was done by friction?

(b) what is the magnitude of the frictional force?

(c) what is the coefficient of friction?

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