(a) A tennis ball of mass 0.08 kg and speed 20 m/s strikes a wall at a

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(a) A tennis ball of mass 0.08 kg and speed 20 m/s strikes a wall at a 45∘ angle and rebounds with the same speed at 45∘. (a) What is the impulse (magnitude and direction) given to the ball? (b) If the same ball, with the same initial velocity, hits an identical ball with v = 0 dead on in an elastic collision, what will the final velocity (just after the collision) of each ball be? (assume the collision is instantaneous). (b)

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(a) A tennis ball of mass

0.08 k g

and speed

20 m / s

strikes a wall at a

45^{\circ}

angle and rebounds with the same speed at

45^{\circ}

. (a) What is the impulse (magnitude and direction) given to the ball? (b) If the same ball, with the same initial velocity, hits an identical ball with

v = 0

dead on in an elastic collision, what will the final velocity (just after the collision) of each ball be? (assume the collision is instantaneous). (b)