Two bowling balls are rolling towards each other. The first has a mass of 5 kg and is rolling with a speed of
4 m/s to the right. The seconds has a mass of 6 kg and is rolling with a speed of 7 m/s to the left. After the
collision, the first bowling ball rolls away with a speed of 5 m/s to the left. How fast is the second ball
rolling after the collision?
a. 7.5 m/s
b. 6.2 m/s
c. 0.5 m/s
d. 0.9 m/s