$($b$)$ Two boxes of mass $m_1=m_2=m=10kg,$ attached together with an inextensible string, are pulled across the floor by a girl using another inextensible string that is making an angle of $30$ with the horizontal, as shown in figure $1.$ The kinetic friction between each box and the ground is $0\mathrm{.}1$ and the boxes are accelerating at $2\mathrm{.}0\frac{m}{s^2}.T_1$ and $T_2$ are the tensions in the two inextensible strings.

$($i$)$ Draw the free$-$body diagram of each of the boxes.

$($ii$)$ What is the tension $(T_1)$ on the string which is attached to the two boxes?

$($iii$)$ What is the tension $(T_2)$ on the string which is in the hand of the girl?