A railroad car of mass 2.54 x 104 kilogram is moving with a speed of 3.88 m/s. It collides and couples with three other coupled railroad cars, each of the similar mass as the single car and moving in the similar direction with an initial speed of 1.94 m/s.
(a) Obtain the speed of the four cars after the collision?
m/s
(b) Obtain how much energy is transformed into internal energy in the collision?
kJ