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 ?
I used for M1 :
Fg1 + T =M1a (with T tension of string)
and for M2 :
The Attempt at a Solution
NOW I'm stuck , I can't solve it , any help ??