Hanging masses

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 :
Fg1 + T =M1a (with T tension of string)
and for M2 :

3. The attempt at a solution
NOW I’m stuck , I can’t solve it , any help ??


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