A $7\mathrm{.}7-$N force pulls horizontally on a $1\mathrm{.}6-$kg block that slides on a smooth horizontal surface. This block is connected by a horizontal string to a second block of mass m$\_2=0\mathrm{.}83$ kg on the same surface. $($a$)$ What is the acceleration of the blocks? $($b$)$ What is the tension in the string? $($c$)$ If the mass of block $1$ is increased, does the tension in the string increase, decrease, or stay the same?