Two identical 7-kg bowling balls roll toward each other. The one on the left is moving at +4 m/s while the one on the right is moving at ?4 m/s. What is the velocity of each ball after they collide elastically?
a. Neither is moving.
b. ?4 m/s, +4 m/s
c. +4 m/s, ?4 m/s
d. ?14 m/s, +14 m/s
e. +14 m/s, –14 m/s
b
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