A 5 kg block moving along a frictionless surface at 2 m/s to the right collides with a 10 kg block moving to the left at 5 m/s. Determine their velocities after collision if a) they stick together after collision; b) the collision is elastic; and c) the collision is inelastic wherein the coefficient of restitution is 0.8. How much kinetic energy is lost in this particular collision?

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