linear momentum

[ingrida1]

1. The problem statement, all variables and given/known data
Derive the above relationship m2(D-c)
X1=---------
m1+m2


2. Relevant equations



3. The attempt at a solution

[berkeman]

Sorry, ingrida1. That would not appear to be enough information for us to help you. Please carefully fill out all three portions of the Homework Help template in your original post. The problem statement should be exactly as stated in your homework set, and you need to fill in the sections on Relevant equations, and your Attempt at a solution.