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In my opinion problem 2.49 from Serway book (see below)
is poorly formulated. Why do they distract student with "the
driver of the car?" He is only an observer. Why does he
"slam on the brake?"
...
"The driver of a car slams on the brakes as a truck
approaches the car head-on while slowing uniformly
with acceleration -5.6 m/s^2. The driver of the car is
frozen with horror for 4.2 s while the truck makes
skid marks 62.4 m long. With what speed does the
truck strike the car?"