1. The problem statement, all variables and given/known data If block A slides with a velocity into block B which is at rest, and after this collision block B ends up with a velocity and block A is stationary after. Block B has a mass of 5m. Would this type of collision be an elastic collision or inelastic? How do you know? What would the velocity of block B be after the collision? 2. Relevant equations M1V1i+M2V2i=M1V1f+M2V2f 3. The attempt at a solution I'm pretty sure this is an elastic collision problem because it seems as though the momentum is conserved and transferred from block A to block B. This is what i did to figure the velocity of block b after the collision- MVi+5MVi=MVf+5MVf MVi+0=0+5MVf MVi=5MVf Vf=Vi/5 But i'm not sure if this is right or what I could do differently..