A stuntman rides a sleigh from rest, down a hill to ground level, to a complete vertical loop, and emerges on the other end of the loop at ground level. If the height of the loop is H, how high does the stuntman have to start to ensure that he can completethe loop safely? Assume the sleigh’s motion is frictionless

A stuntman rides a sleigh from rest, down a hill to ground level, to a complete vertical loop, and emerges on the other end of the loop at ground level. If the height of the loop is H, how high does the stuntman have to start to ensure that he can completethe loop safely? Assume the sleigh’s motion is frictionless

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