A car (mass = 1100 kg) is traveling at 33.0 m/s when it collides head-on with a sport utility vehicle (mass = 2800 kg) traveling in the opposite direction. In the collision, the two vehicles come to a halt. At what speed was the sport utility vehicle traveling?

Answer 1

final momentum=0, so sum of vehicles' momenta is 0.

1100*33 + 2800*v = 0
36300 = -2800v
v = -12.96

speed is just 12.96 m/s