CESSAGEMY INSTRUCTOR ru scREEN PRINTER VERSION BACK Chapter 02, Problem 028 on r

Question

CESSAGEMY INSTRUCTOR ru scREEN PRINTER VERSION BACK Chapter 02, Problem 028 on road, a car with good tires may be able to brake with a constant deceleration of 3.41 m/s2. (a) How long does such a ar, a dry initially traveling at 21.1 m/s, take to stop? (b) How does it travel in this time? Units (a) Number Units (b) Number cuck if you would like to show work for this question: open show wadk Question Attempts: 0 of 6 used SAVE FOR LATER SUBMIT ANSWER copyright 2000-2017 by John Wiley sons, Inc. er related companies. Al rights reserved. MacBook Air o L P 1 t

Explanation / Answer

Here ,

acceleration ,a = -3.41 m/s^2

a) let the time taken is t

Using first equation of motion

v = u + a * t

0 = 21.1 - 3.41 * t

t = 6.19 s

the time taken is 6.19 s

b)

Using second equation of motion

disance travelled = u * t - 0.5 * a * t^2

disance travelled = 21.1 * 6.19 - 0.5 *3.41 * 6.19^2

disance travelled = 65.3 m

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