guys how to determine the direction of the ball when hit by something like those of PONG game or in tennis/table tenis? Do u have any samples on it in 3D? please i really nee this one for our projects

The physics of the ball in pong is very simple. Angle of reflection equals the angle of incidence. Unfortunately you are talking about tennis in your heading. The physics of tennis need to include the way the racquet is being swung, as well as the lateral movement of the racquet when it is in contact with the ball (spin). Additionally, the tennis ball deforms when it hits the racquet. All in all the interactions for tennis are quite a bit more complex.

Maybe if you described your intended use for the results, we could tailor the response a bit more specifically for your needs?