Question

You are driving through town at 14 m/s when suddenly a car backs out of a driveway in front of you. You apply the brakes and begin decelerating at 3.3 m/s2.How much time does it take to stop? After braking half the time found in part A, is your speed 7.0 m/s, greater than 7.0 m/s, or less than 7.0 m/s?

Answer 1

Vi = 14
a = -3.3

v = Vi + a t
at stop, v = 0
0 = 14 - 3.3 t
3.3 t = 14


for half time
if t = 7/3.3
v = 14 - 3.3 (7/3.3)
v = 14 - 7 = 7 on the nose
then

Answer 2

Find your speed after braking half the time found in part A. pls answer this part

Answer 3

6s