A railroad car of mass 2.3 x 104 kilogram moving at 3.00 m/s collides and couples with two coupled railroad cars, each of the equal mass as the single car and moving in the similar direction at 1.20 m/s.
(a) Obtain what the speed of three coupled cars after collision?
m/s
(b) Obtain how much kinetic energy is lost in the collision?
J