Question

8. A mass of 3 kg is traveling across a frictionless surface to the right at a speed of 3 m/s. It collides with a 1 kg mass that is traveling at 4 m/s to the left. After the collision, the center of mass of the system is moving at what velocity? (Take positive velocities to be to the right and negative velocities to be to the left.)

a) -0.250 m/s b) +0.500 m/s c) +1.25 m/s d) +2.00 m/s e) -2.00 m/s

9. Consider the situation given in the previous problem. Assuming that the collision is perfectly elastic, then the final velocity of the 1 kg mass is:

a) 3.50 m/s b) -3.00 m/s c) 6.50 m/s d) 8.00 m/s e) 5.00 m/s

Answer 1