A pool ball is rolling at a velocity of 12 cm/s to the right when it is hit by another ball. It continues moving right at a velocity of 21 cm/s. If the collision lasts 0.45 seconds, what is the ball's acceleration?
A.+9 cm/s2
B. 20 cm/s2 to the right
C. 26 cm/s2 to the right
D.+46 cm/s2
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