Two billiard balls of masses m1= 10.0 kg and m2= 6.0 kg collide elastically with velocities v1= 9.0 m/s and V2= 5.0 m/s.  Calculate their velocity of ball two after the collision, considering that the velocity of the ball of m1 after the collision is 4.0 m/s, if at the beginning and end they move in the same direction. a. 133 m/s b. 13 m/s c. None of the above d. 103.33 m/s

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