Answers: 2
where 
is the change in momentum, m is the mass of the ball, v is the final velocity of the ball and u is the initial velocity of the ball. 
for m, -18 m/s for v since it's in opposite direction and 12 m/s for u then
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A 6.0 x 10^-2 kg tennis ball moves at velocity of 12 ,/s. the ball is struck by a racket, causing it...
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