T 3.)A car traveling at 21 m/s misses the turnoff
on the road and collides into the safety
guard rail. The car comes to a complete
stop in 0.55 s.
a. What is the average acceleration of the
car?
b. If the safety rail consisted of a section
of rigid rail, the car would stop in
0.15 s. What would be the acceleration
in this case?