A steel block of 5 kg moves from left to right with a velocity of 2 m/s. This block collides with a mass of 3 kg (another steel block) moving along the same line but in the opposite direction at 4 m/s. Assuming the collision is elastic and the surface upon which they move is frictionless, please determine the velocities of each mass after they bounce off each other. Use a coordinate system.
a. Answer for the 5 kg mass
b. Answer for the 3 kg mass