a vehicle slows from 14 m/s west to 2.0 m/s west in 2.86 seconds. what is the acceleration of the vehicle in m/s/s?

The vehicle's acceleration is - 4.20 m/s/s

Explanation:

(acceleration m/s/s) = (change in velocity m/s) / (change in time s)

(acceleration) = (2.0-14.0 m/s) / (2.86 s) = - 4.20 m/s/s

The acceleration is - 4.20 meters per second squared. The negative sign indicates the vehicle is decelerating (slowing down).