A tennis ball of mass 57 g was moving horizontally at 68.4 m/s when it collided with a vertical racket that was at rest, after which it rebounded at 18.8 m/s. Given that the contact time between the ball and racket was of a second, find the magnitude of the average impact force.
A sphere of mass 125 g was moving along a section of horizontal ground at 165 cm/s when it hit a vertical wall. Given that the wall applied an impulse of magnitude 0.214 N⋅s to the sphere, find the speed of the sphere as it bounced off the wall.
A smooth sphere of mass 1 412 g was moving horizontally in a straight line at 13.5 m/s when it hit a smooth vertical wall and rebounded at 9 m/s. Determine the magnitude of the impulse exerted on the sphere.