You can make the walls solid and add Bullet and Drag&drop behavior to the ball.
By default bullet is disabled. In "Ball Is dragging" event save Touch.SpeedAt(0) and Touch.AngleAt(0) in a pair of variables (tSpeed and tAngle for example). In "Ball On drop" event enable Bullet for this ball, set bullet speed to tSpeed, and bullet angle of motion to tAngle.