a). Two 1.5 kg balls move away from each other, one traveling 1 m/s to the right, the other 1 m/s to the left. What is the magnitude of the total momentum of the system? Answer in units of kg · m/s
b). Two 1000 kg cars drive east; the first moving at 25 m/s, the second at 15 m/s. What is the magnitude of the total momentum of the system? Answer in units of kg · m/s