You are traveling in your car at 82 km/h (23 m/s)when an emergency arises.If your car is 4 m long,how many car lengths do you travel during the 0.7 s of reaction time (i.e.,the time interval between seeing the emergency and hitting the brake with your foot)?
A)2
B)4
C)6
D)8
E)10

Question

Quizplus · Accepted Answer

First, we need to find how far the car travels during the reaction time.

distance = speed x time

distance = 23 m/s x 0.7 s = 16.1 m

Next, we need to find how many car lengths that distance is equal to.

car length = 4 m

number of car lengths = distance / car length

number of car lengths = 16.1 m / 4 m = 4.025

Since we can't have a fraction of a car length, we round down to the nearest whole number.

Therefore, during the 0.7 s of reaction time at 82 km/h, you would travel approximately 4 car lengths.

You Are Traveling in Your Car at 82 Km/h (23