Mary and Sally are in a foot race. When Mary is 22 m from the finish line, she has a speed of 4 m/s and is 5 m behind Sally, who has a speed of 5 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, she decelerates at a constant rate of 0.40 m/s? to the finish line. What constant acceleration does Mary need during the remaining portion of the race if she wishes to cross the finish line side-by-side with Sally?
Mary and Sally are in a foot race. When Mary is 22 m from the finish line, she has a speed of 4 m/s and is 5 m behind Sally, who has a speed of 5 m/s. Sally thinks she has an easy win and so, during the remaining portion of the race, she decelerates at a constant rate of 0.40 m/s? to the finish line. What constant acceleration does Mary need during the remaining portion of the race if she wishes to cross the finish line side-by-side with Sally?
Sustainable Energy
2nd Edition
ISBN:9781337551663
Author:DUNLAP, Richard A.
Publisher:DUNLAP, Richard A.
Chapter18: Energy Storage
Section: Chapter Questions
Problem 4P
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Transcribed Image Text:Mary and Sally are in a foot race. When Mary is 22 m from the finish line, she
has a speed of 4 m/s and is 5 m behind Sally, who has a speed of 5 m/s. Sally thinks
she has an easy win and so, during the remaining portion of the race, she
decelerates at a constant rate of 0.40 m/s? to the finish line. What constant
acceleration does Mary need during the remaining portion of the race if she
wishes to cross the finish line side-by-side with Sally?
0.50 m/s^2
O 0.60 m/s^2
O 0.70 m/s^2
O 0.80 m/s^2
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