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## Homework Statement

Show that a simple pendulum bob which has been pulled aside from its equilibrium position through an angle ##\theta## and then released will pass through the equilibrium position with speed ##v = \sqrt{2gl(1-cos\theta)}##, where ##l## is the length of the pendulum.

## Homework Equations

##K.E = \frac{1}{2}mv^2##

##P.E = mgh##

## The Attempt at a Solution

I tried a lot in finding the start of the solution but I have no idea from where to start.