part $7$ and $8$ please:

$007($part $1$ of $2)\backslash (\backslash$mathbf$\{10.0\}\backslash )$ points

A plank having mass $2\mathrm{.}6$ kg rides on top of two identical solid cylindrical rollers each having radius $5$ cm and mass $1\mathrm{.}9$ kg $.$ The plank is pulled by a constant horizontal force $6$ N applied to its end and perpendicular to the axes of the cylinders $($which are parallel$).$ The cylinders roll without slipping on a flat surface. There is also no slipping between cylinders and plank.

Find the acceleration of the plank.

Answer in units of $\backslash (\backslash$mathrm$\{$m$\}/\backslash$mathrm$\{$s$\}^\{2\}\backslash ).$

$008($part $2$ of $2)10\mathrm{.}0$ points

Find the frictional force acting on the plank. Answer in units of N $.$