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## Homework Statement

https://int.erlace.com/uploads/teacher/1533/images/3modifiedatwood(1).jpg [Broken]

Ignore friction and the the rope and the pulley and the rope have negligible mass.

- When the hanging block
- That work went into the kinetic energy of the masses. What fraction of that kinetic energy went into the motion of the hanging block?
- Suppose now there's a coefficient of kinetic friction

## Homework Equations

## The Attempt at a Solution

1. I figured the work done was equal to change in potential energy, so

2. I'm not sure how to go about this one. I tried to take what I found for the work done and relate it the kinetic energy of the masses, so something like

3. Not sure. I derived an expression for acceleration of the system, and again I don't know if it would help.

Thanks.

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