In a setup, there are two blocks on a horrizontal surface: Block A with a mass of $5$kg$,$ and block B with a mass of $7$kg$.$ These blocks are connected by a lightweght string. Block a experiences a force $($Fa$)=14$ newtons $($N$),$ while block B is subject to a force Fb $=27$N$.$Determin the following:

$1$; What is the magnitude of the acceleration of the system

$2$; the tension in the string