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In this lesson, we will learn how to calculate the impulse of a constant force on a body and its relation with the change in the momentum of this body.

Q1:

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 1 2 5 of a second, find the magnitude of the average impact force.

Q2:

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.

Q3:

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.

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