A $10-$ft$-$long, $6-$ft$-$high rectangular tank open to the atmosphere is towed by a truck on a level road. The tank is filled with water to a depth of $5$ ft $.$ Determine the maximum acceleration or deceleration allowed if no water is to spill during towing.

The maximum acceleration or deceleration allowed if no water is to spill during towing is $f\frac{t}{s^2}$ or $-f\frac{t}{s^2}$