Asked by katie
You are arguing over a cell phone while trailing an unmarked police car by 25.0 m; both your car and the police car are traveling at 120 km/h. Your argument diverts your attention from the police car for 2.0 s (long enough for you to look at the phone and yell,“I won't do that!”). At the beginning of that 2.0 s, the police officer begins braking suddenly at 6.00 m/s2. (a) What is the separation between the two cars when your attention finally returns? Suppose that you take another 0.400 s to realize your danger and begin braking. (b) If you too brake at 6.00 m/s2, what is your speed (in km/h) when you hit the police car?
Answers
Answered by
Henry
Vo = 120km/h = 120000m/3600s=33.33 m/s.
d1 = Vo*t + 0.5a*t^2
d1 = 33.33*2 + (-3)*2^2 = 54.66 m Traveled by policeman in 2 s.
d2 = Vo * t = 33.33 * 2 = 66.66 m/s. =
Distance traveled by me in 2 s.
d3 = Do - (d2-d1)
d3=25 - (66.66-54.66)=13 m = Separation
between me and the policeman.
b. d1 = Vo * t = 33.33 * 0.40 = 13.33 m
Oops! I hit the cop.
Speed = 120 km/h Because I hit the car before I started breaking.
d1 = Vo*t + 0.5a*t^2
d1 = 33.33*2 + (-3)*2^2 = 54.66 m Traveled by policeman in 2 s.
d2 = Vo * t = 33.33 * 2 = 66.66 m/s. =
Distance traveled by me in 2 s.
d3 = Do - (d2-d1)
d3=25 - (66.66-54.66)=13 m = Separation
between me and the policeman.
b. d1 = Vo * t = 33.33 * 0.40 = 13.33 m
Oops! I hit the cop.
Speed = 120 km/h Because I hit the car before I started breaking.
There are no AI answers yet. The ability to request AI answers is coming soon!
Submit Your Answer
We prioritize human answers over AI answers.
If you are human, and you can answer this question, please submit your answer.