Idea is from page 37 of the art_of_maya.pdf online book.
Bounce Expression
  
ball.translateX = time * 5;
ball.translateY = 6 * abs(sin(time*3));
  
ball.rotateZ = -(time*81);
  
ball.scaleX = 1 + time / 2;
ball.scaleY = 1 + time / 2;
ball.scaleZ = 1 + time / 2;