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## Homework Statement

a ball of mass m is attached to a light string of length L and suspended vertically. A constant force, which magnitude F equals the weight of the ball, is applied horizontally to the ball. Determine the speed of the ball as t reaches the 90degree level in terms of L and g= 10 m/s^2

## Homework Equations

not sure really!

http://img132.imageshack.us/img132/7374/phyiscsek4.jpg [Broken]

## The Attempt at a Solution

I honestly do not have a clue where to start on this question. Can anyone give me a start?

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