Projectile Motion

While playing tennis, there is actually physics related to the sport. Projectile motion is "the movement determined by an object's initial velocity and the constant acceleration of gravity." This works when there is zero air resistance. When I hit the ball, it starts traveling across the court at a certain velocity until it gradually changes due to gravity. The ball bounces on the ground, and then the other player hits the ball back. The horizontal velocity put on the ball never changes throughout the ball's flight. The time it takes the ball to bounce isn't affected by the amount of horizontal velocity the ball has, it is depended on the initial velocity and gravity put on the ball. This projectile motion may be more obvious when a lob is hit because the force of gravity acting upon the ball's initial velocity can easily be seen. The ball is hit up and falls back down because of its acceleration of -9.8 m/s/s, but the ball never changes its horizontal velocity until it hits the ground because there isn't a force changing it.