Bart and Nelson challenged each other to a bumper car game.
Bart, whose car had a mass of 120 kg (with him in it), traveled
west at a velocity of 9 m/s. Nelson and his car had a total mass of
150 kg traveled a velocity of 7 m/s east, heading towards Bart. The
two had a head-on collision. Use the frame of reference in which
the east is positive.
a) If Bart left the collision at a velocity of...