Finding the tension of a string with 2 blocks attached.

[rnien]

Homework Statement

There is a string hanging down with a 2 kg block attached, at the bottom of this block is another string attached holding another 2 kg block. This has begun to accelerate. The given time is .7 s for acceleration, and the given velocity it reaches is .35.
I have to find the tensions of both the strings, and I am not exactly how to/what formulas to use.

So far I have calculated the acceleration to = .5 m/s2 though.
But I do not know how to use it.

 

[jegues]

Calculate the acceleration using Vf = Vo + at then,

Consider the 2 block system as a one block system, calculate the tension.

(Hint: Newtons 2nd Law)

Then define the 2 separate tensions accordingly.

 

[denverdoc]

First body: m*a=sum of all forces acting on it=T1-T2-mg
Second body m*a=T2-mg

Adding the two equations gives 2m*a=T1-2mg
T2 can be solved directly.

Edit: sorry Jeques, simultaneous post. I'm happy for the help and will say good night!