**1. The problem statement, all variables and given/known data**

A hanging mass M1 =1 kg is attached by a light string that runs over a frictionless pulley to a mass M2=2 kg that is initially at rest on a frictionles table .

What is the magnitude of the acceleration a of M2 ?

**2. Relevant equations**

I used for M1 :

F_{g1} + T =M1a (with T tension of string)

and for M2 :

N+F_{g2}+T=M2a

**3. The attempt at a solution**

NOW I’m stuck , I can’t solve it , any help ??

http://ift.tt/1j730qP