Two bodies of masses 60g and 20g respectively head towards each with velocities 4.0 m/s and 2.5 m/s respectively on a frictionless horizontal surface. The bodies collide and after the collision a and b move in initial direction of a with velocities 2.0m/s and v. 1) Find the value of v 2) Calculate the total kinetic energy before and after collision. 3) Use your answer to explain whether the collision is elastic or inelastic