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## Homework Statement

part(b) and (c)

## Homework Equations

Conservation of momentum

Conservation of angular momentum

Conservation of mechanical energy

## The Attempt at a Solution

So first I thought that I could do it by just using the conservation of mechanical energy, but then I realized that since the lower part of the hoop hits the platform, the energy can't be conserved (there's energy lost):

1/2 mv^2 + 1/2 Iw^2 = mgh + Energy lost

mv^2 = mgh + Energy lost

I think that part (b) and (c) is very related, once we know the energy lost, we can determine the v needed, however I don't really understand how to find its value. Any suggestion ??