WileyPLus https//edugen wileyplus.com/eduger/lti/main.uni Halliday, Fundamentals

Question

WileyPLus https//edugen wileyplus.com/eduger/lti/main.uni Halliday, Fundamentals of Physics, 10e Help l Chapter 02, Problem 030 The brakes on your automobile are capable of creating a deceleration of 5.1 m/s?. If you are going 131 km/h and suddenly see a state trooper, what is the minimum time in which can get your car under the 85 km/h speed limit? (The answer reveals the futility of braking to keep your high speed from being detected with a radar or laser oun.) NumberI the tolerance is +/-2% Units SHOW HIN LINK TO SAMPLE PROBLEM LINK TO SAMPLE PROBLEM VIDEO MINI-LECTURE MATH HELP MATH HELP MATH HELP MATH HELP LINK TO TEXT SAVE FOR LATER Question Attempts: 0 of 6 used testag istun?id=asnmt2132537#N10024

Explanation / Answer

vi = 131 km/hr

= 131*1000 m / 3600 s

= 36.39 m/s

vf = 85 km/hr

= 85*1000 m / 3600 s

= 23.61 m/s

a = -5.1 m/s^2

negative because this is deceleration

use:

vf = vi + a*t

23.61 = 36.39 - 5.1*t

5.1*t = 12.78

t = 2.5 s

Answer: 2.5 s

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