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## Homework Statement

[PLAIN]http://img189.imageshack.us/img189/5994/energyq.png [Broken]

## Homework Equations

This is a question by Monash University...i need to do part b by Energy conservation equations...but i don;t get the answer from that..

plzz tell me how to do part b by Energy conservation equations...

thank u

## The Attempt at a Solution

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