Block B has a mass of 3.40kg and is moving to the left at a speed of 4.20m/s. Block A has a mass of 6.40kg and is moving to the right. The two blocks undergo a perfectly inelastic collision. What should the velocity of the Block A be in order to have the two blocks move to the right with a speed of 0.87 m/s after the collision?

1 answer

m1v1 + m2v2 = (m1+m2)vf
solve for v1