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a skier, mass 61 kg is at the top of a hill and starts down with an initial speed of 5m/s. he does no work on the way down, assume that the hill surface is frictionless. find his speed at the bottom of the hill which is 10m below the top.

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PE at top: m g h
Ke at the bottom equals PE at top.
1/2 m v^2=mgh
v=sqrt(2gh)

so 14m/s?

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