Rewrite Programming Exercise 20.5 using a thread to animate bouncing ball movements.

The example in Section displays multiple bouncing balls. Extend the example to detect collisions. Once two balls collide, remove the later ball that was added to the pane and add its radius to the other ball, as shown in Figure . Use the?Suspend?button to suspend the animation and the?Resume?button to resume the animation. Add a mouse pressed handler that removes a ball when the mouse is pressed on the ball.

|X| |Exercise20_05 Suspend Resume