Billiard ball A has mass 19.7 kg and is moving to the right at speed 31.5 m/s. Billiard ball B also has mass 19.7 kg, but is moving to the left at speed 17.6 m/s. The two masses collids. What is the total momentum of the two billiard balls before the collision?
a) 0 kg m/s
b) 355.7 kg m/s
c) -355.7 kg m/s
d) Cannot be determined