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Answer 1 · 2017-12-15T01:10:43

The acceleration of the truck is #-6.0 m/s^2#

The 72 m/s is the initial speed, while zero is the final speed. Therefore, the change in speed is #v_f-v_i=-72 m/s#

The acceleration is the rate at which the speed changes each second.

#a=(Deltav)/(Deltat)#

Because this happens in 12 seconds, we can write

#a= (-72)/(12) = -6.0 m/s^2#

Note the units on acceleration #m/s^2# is read as "meters per second each second"