On a smooth horizontal plane, there is a uniform thin plate with a mass of 4kg, which moves at a uniform speed of 3m / s. A 1kg ball falls into point a 20 m above the plate and rebounds to 5M high. The collision lasts for a very short time, and the gravitational impulse can be ignored 1. The elastic impulse of the plate to the ball during the collision 2. The dynamic friction coefficient between the plate and the ball is 0.08, and the velocity and direction of the plate after collision are calculated Does the ball have a horizontal speed after touch? If so, send it out 3. When the ball falls back on the board again, the distance between the ball's landing point on the board and a

On a smooth horizontal plane, there is a uniform thin plate with a mass of 4kg, which moves at a uniform speed of 3m / s. A 1kg ball falls into point a 20 m above the plate and rebounds to 5M high. The collision lasts for a very short time, and the gravitational impulse can be ignored 1. The elastic impulse of the plate to the ball during the collision 2. The dynamic friction coefficient between the plate and the ball is 0.08, and the velocity and direction of the plate after collision are calculated Does the ball have a horizontal speed after touch? If so, send it out 3. When the ball falls back on the board again, the distance between the ball's landing point on the board and a

1. Calculate the initial and final momentum
2. The impulse of friction can be calculated by multiplying the impulse calculated above by a dynamic friction coefficient. Note that this is the impulse of friction on the ball, and the impulse of friction on the plate should be opposite to that on the ball. The ball also has horizontal velocity, because there is a impulse of friction
3. According to the horizontal velocity of the ball and the board, combined with the falling time of the ball, the distance relative to a can be calculated
The above is for reference only. If there is any mistake, please correct it