A $13$ kg block $($mass $1)$ and a $5\mathrm{.}0$ kg block $($mass $2)$ are connected by a light string $($see figure for problem $6-45$ in volume $1)$; the inclination of the ramp is $60$ degrees. The coefficient of kinetic friction between mass $1$ and the ramp is $0\mathrm{.}35.$ What is $($a$)$ the acceleration of each block and $($b$)$ the tension in the string?