Question
Asked Aug 27, 2019
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Mary and sally are in a foot race. 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/s^2 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?

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shown in the fiqusre below Griven situation will be as Tmls 4mls FINISH LINE 5m 22m From the above, Sally is (tm rom the inish line

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by Sally to reach 4irst calaulate the time equidted the finish ine we have, ut +at -04) 17= st-o.1t O - Soloing the above quadratic equation time t20.4 S get, we

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Slly side-by-side, time at CYOSSCS Stnce Maruy cro sses the finich ine oll be (ohich may that of Sally Same as

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