Erica throws a tennis ball against a wall, and it bounces back. Which force is responsible for sending the ball back to Erica? t
he force that the ball exerts on the wall the frictional force between the wall and the ball the acceleration of the ball as it approaches the wall the normal force that the wall exerts on the ball
"when an object A exerts a force on object B, then object B exerts an equal and opposite force on object A".
If we apply this law to this problem, we can identify the ball as object A, and the wall as object B. As the ball hits the wall, the ball exerts a force on the wall (toward the direction of motion of the ball), so the wall exerts an equal and opposite force on the ball (in the opposite direction). This force is the normal force of the wall, and it is responsible for pushing the ball back towards Erica.
