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## Homework Statement

A mass starts from rest at the upper rim of a semi-circle of radius 8m. In the bottom of this there is a region of size 1m which has a coefficient of kinetic friction of 0.5. What is the maximum height that the mass reaches after passing through this region once?

http://imageshack.us/photo/my-images/848/circularmotionfriction.png/"

## Homework Equations

Note: arc length

∫cos(ax)dx = 1/a sin(ax)

## The Attempt at a Solution

I do not know where to start. :S

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