Question

An automobile moving northward with a velocity of 270m/s is brought to rest in 45 seconds .
find the average acceleration durong this time interval.
express the answer in ft/sec^2

Answer 1

ft/sec^2? good lord.

270m/s=270m/s*3.28ft/m

vf=vi+at
a= (vf-vi)/t and vf=0
solve for a