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If supersonic ping pong balls can't do enough damage alone, filling the balls with water first and then firing them will give them a bit more destructive punch. Ideally a vacuum cannon can expel a ping pong ball to exit velocities somewhere between 400-600 miles an hour, impressive by itself but adding a compressed air behind it and the ball can go supersonic. My combination appears to top out around 900 miles an hour, while several other more advanced models can reach 1200 mph, there is even one claiming to top 1700 mph.