A car traveling east at 44.8 m/s passes a trooper hiding at the roadside.

A car traveling east at 44.8 m/s passes a trooper hiding at the roadside. The driver uniformly reduces his speed to 25.0 m/s in 3.70 s.


A. What is the magnitude and direction of the car's acceleration as it slows down?
magnitude ? m/s2
direction ?

B. How far does the car travel in the 3.70-s time period?
m

v(t) = at + v0
25.0 = a(3.70) + 44.8
Solve for a.

d = Vaverage * t
When acceleration is constant, Vaverage = (Vinitial + Vfinal) / 2
d = ((44.8 + 25.0) / 2) * 3.70