Physics Help Momentum???

Question

If an object of mass m1 = 0.10 kg is sliding without friction in the +x-direction on a level surface at a speed of v1=0.24m/s and it collides with a stationary object of mass m1 = 0.10 kg, determine the total initial and final momenta (before and after the collision) as well as the total initial and final Mechanical Energy (before and after the collision) for:
1) a perfectly elastic collision
2) a perfectly inelastic collision.

3) State what the useful energies in and out are and then calculate the efficiency for the perfectly elastic and the efficiency for the perfectly inelastic collisions described above.