1. The problem statement, all variables and given/known data For a lab, I have performed a completely inelastic collision using 2 masses. One mass is 0.583 kg, and the other is the unknown we have to find. Using an air table, I was given the dots to show the movements of the objects as they intersect and them move together. I have broken them into components and solved for the velocity and the momentum for each. Well, thats where the problem is: Momentum of the known mass: m1v1 = p1 m1x(v1x) = p1x m1y(v1y) = p1y Same thing for the second mass, except it is m2, an unknown. When they move together, I know the mass will be the total (m1 + m2, which i state as m3) and the velocity will also be something else, v3. Now, the problem: I am trying to do m1v1 + m2v2 = m3v3 to find the unknown mass Question is, how would i rearrange the equation to find this m2. 2. Relevant equations mv = p 1/2mv^2 3. The attempt at a solution I am just trying with the 'x' component for the example: m1 = 0.583 kg v1x = 0.18 m/s [E] m2 = unknown v2x = 0.29 m/s [W] m3 = m1 + m2 v3x = 0.05 m/s [W] m1v1 + m2v2 = m3v3 How can i find this mass, it cancels out the moment I bring one of the m2's to the other side , I am I making some mistake here? I know it may not seem like I did any work, but I have pages of work getting to this part haha.