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March 1, 2015

Posted by **Amy** on Monday, February 13, 2012 at 11:03pm.

Do you need to know how the speed of the person changed before you can answer the question?

Suppose he started at the highest point of the wheel. What is the net work done by the gravitational force when he reaches the lowest point?

- physics -
**Damon**, Monday, February 13, 2012 at 11:07pmzero. potential energy in gravity is m g h

If you come back to the same h, no net work was done.

(you had to put work in going up, you took it out coming down.)

In the second part it is m g htop -mghbottom

= m g (2R)

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