<In Pic 1>
(1/2)mv2 = 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?