Acar slams on its brakes, coming to a complete stop in 4.0 seconds. the car was traveling south at 60.0 mph. calculate the acceleration.

Alright let's start this off with our basic equation!

Accerlation (a) = ?

Initial velocity (V1)= 60 mph = 88 ft/s (because we HAVE to convert mph to ft/s to match time)

Final velocity (V2) = 0 ft/s because the car stops

Time (t) = 4 seconds

a = 
a = 
a = 
a = -22 

Therefore, your acceleration is -22 ft/s² !! Hope this helped and was one of the branliest answers :')