) final

) final final x mu p = − Impulse is the change in momentum vector. Therefore, x -component of impulse = – m u y -component of impulse = Impulse and force are in the same direction. Clearly, from above, the force on the ball due to the wall is normal to the wall, along the negative x-direction. Using Newton’s third law of motion, the force on the wall due to the ball is normal to the wall along the positive x-direction. The magnitude of force cannot be ascertained since the small time taken for the collision has not been specified in the problem. Case (b) cos initial x m u