Laura asks…A railroad car of mass 3.2 104 kg moving at 2.50 m/s collides and couples with two coupled railroad cars?A railroad car of mass 3.2 104 kg moving at 2.50 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?
(b) How much kinetic energy is lost in the collision?Nancy answers:I prefer to use symbolic notation just to
