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## Homework Statement

<In Pic 1>

## Homework Equations

(1/2)mv

^{2}= ΔU

## The Attempt at a Solution

I thought that if i apply the equations i'll have my answer but i got 2.5m/s while answer is 3m/s

Please refer the solution given by some book --- Pic2, Pic3

<sorry for bad image, my scanner nt working properly >

Please tell me what is wrong i my method?