Question

A car traveling 60 mi/h along a straight road decelerates at
a constant rate of 11 ft/s2.
(a) How long will it take until the speed is 45 mi/h?
(b) How far will the car travel before coming to a stop?

Answer 1

Vi = 60 mi/h * 5280 ft/mi /3600 s/h
Vf = 45 * 5280/3600

Vf = Vi - 11 t
solve for t

===========================
0 = Vi - 11 T
T = Vi/11

d = Vi T - 5.5 T^2

Answer 2

this sucks