Vertical bounce height: The value of natural grass is between 25% and 45%, and the value of artificial grass is between 30% and 42%.
The rolling speed of the ball: The value of the natural grass is 4 m and 10 m, and artificial grass is 4 m and 10 m.
Bounce of different angle balls: Landing at a 25 degree angle, bounce speed of 50 kilometers per hour, height 60% to 80%.