A car traveling east at 41.1 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 3.

A car traveling east at 41.1 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 3.20 s. (a) What is the magnitude and direction of the car’s acceleration as it slows down?