Question: A 10.0 g object moving to the right at 19.0 cm/s makes an elastic head-on collision with a 15.0 g object moving in the opposite direction at 36.0 cm/s. Find the velocity of each object after the collision. -I am little lost with this problem, I tried using the conservation of momentum equation (M1V1i+M2V2i=M1V1f+M2V2f), but since there are two unknowns I don't know what other equation to use. The answer for both problems need to be in cm/s. Can anyone help me with this?