- #1

unscientific

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## Homework Statement

http://i50.tinypic.com/mmws94.png

## Homework Equations

## The Attempt at a Solution

1. Angular momentum is constant; J = constant

2. Total energy is constant; E = constant

Not sure why I am ending up with a 2gr instead..as U = ∫ f dr = ∫ mg dr

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