A railroad car of mass2.52multiplied by104kg is moving with a speed of3.95m/s. It collides and couples with three other coupled railroad cars, each of the same mass as the single car and moving in the same direction with an initial speed of1.98m/s.
(a) What is the speed of the four cars after the collision?
m/s
(b) How much mechanical energy is lost in the collision?
J