· (III) Mary and Sally are in a foot race (Fig. 2–39). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.40 m/s² to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Finish Sally Mary „4.0 m/s 5.0 m/s –5.0 m →| | -22 m- FIGURE 2-39 Problem 37.

· (III) Mary and Sally are in a foot race (Fig. 2–39). When Mary is 22 m from the finish line, she has a speed of 4.0 m/s and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, decelerates at a constant rate of 0.40 m/s² to the finish line. What constant acceleration does Mary now need during the remaining portion of the race, if she wishes to cross the finish line side-by-side with Sally? Finish Sally Mary „4.0 m/s 5.0 m/s –5.0 m →| | -22 m- FIGURE 2-39 Problem 37.

College Physics

11th Edition

ISBN:9781305952300

Author:Raymond A. Serway, Chris Vuille

Publisher:Raymond A. Serway, Chris Vuille

Chapter1: Units, Trigonometry. And Vectors

Section: Chapter Questions

Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...

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Question

· (III) Mary and Sally are in a foot race (Fig. 2–39). When
Mary is 22 m from the finish line, she has a speed of 4.0 m/s
and is 5.0 m behind Sally, who has a speed of 5.0 m/s. Sally
thinks she has an easy win and so, during the remaining
portion of the race, decelerates at a constant rate of
0.40 m/s² to the finish line. What constant acceleration does
Mary now need during the remaining portion of the race, if
she wishes to cross the finish line side-by-side with Sally?
Finish
Sally
Mary
„4.0 m/s
5.0 m/s
–5.0 m →|
|
-22 m-
FIGURE 2-39 Problem 37.

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