Robert asks…A railroad car of mass 2.40 104 kg moving at 3.50 m/s collides?A railroad car of mass 2.40 104 kg moving at 3.50 m/s collides and couples with two coupled railroad cars, each of the same mass as the single car and moving in the same direction at 1.20 m/s.
(a) What is the speed of the three coupled cars after the collision?
____ m/s
(b) How much kinetic energy is lost in the collision?
_____ JNancy answers:A railroad car of mass 2.40 * 10^4 kg moving at 3.50 m/s collides and
