Pendulum - Modified 2

I am trying to find a way of incorporating a damping effect so that the pendulum will slow down and eventually stop, also I would like it to start swinging at a predefined place rather than having to be dragged (even though I have modified it I still need to drag the ball to get it to start).

This is where I got the original code from : http://www.greenfoot.org/scenarios/4033

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