Question: A child on a sled (total mass m) starts from rest at the top of a hill of height h and slides down. Does the

A child on a sled (total mass m) starts from rest at the top of a hill of height h and slides down. Does the velocity at the bottom depend on the angle of the hill if
(a) It is icy and there is no friction, and
(b) There is friction (deep snow)?

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