a railroad car with a mass of 5.0 * 105-kgcollides with a stationary railroad car of equal mass.After the collision, the two cars lock together and move off at4.0-m/s.
a) before the collision, the first railroad car was moving at8.0-m/s. what was its momentum?
b) what was the total momentum of the two cars after thecollision?
c) what were the kinetic energies of the two cars before andafter the collision
d) account for the loss of kinetic energy?