After the ball leaves, the racquet mass center (balance point) moves at a slower speed, and this means a loss of its kinetic energy (kinetic energy = 1/2 mass times velocity squared).
After the ball leaves, the racquet mass center (balance point) moves at a slower speed, and this means a loss of its kinetic energy (kinetic energy = 1/2 mass times velocity squared).
球离开之后，球拍开始减速，球拍减速的过程就是能量释放的过程，释放能量的值等于?（球拍）质量乘以速度的平方。