A car slams on its brakes, coming to a complete stop in 4 sec. The car was traveling north at 60 mph. Calculate the acceleration

Answer 1

60 mph = 88 ft/s

acceleration = (change in V)/(time) =
(88 ft/s)/4s = 22 ft/s^2

That is about (2/3) g

The acceleration DIRECTION is south, in case they want to know that too