Two identical blocks are joined by a wire over a horizontal table. Assume the friction between the table and the blocks is negligible. The wire can bear a maximum tension of $6\,N$. If the two block are pulled by a Force as a function of time t given in seconds. Find the instant (in seconds) when the wire breaks.

The alternatives are as follows:

$\begin{array}{ll}

1.&4\,N\\

2.&5\,N\\

3.&6\,N\\

4.&8\,N\\

5.&10\,N\\

\end{array}$

In this problem I'm still stuck at exactly how should I use the fact that I'm given the maximum tension of the wire between the conecting blocks.

The only thing which I could spot is that the Force is a function of time as follows:

$F(t)=2+2t$

If I were to use the tension which is in tandem for the two blocks would be as follows:

$T=ma$

$F-T=ma$

Therefore:

$F=2ma$

But I don't really know how can I connect one information with another. Can someone help me here?. I'm confused exactly what should I do.