Bookmarks Develop Window Help Cutnell, Physics, 10e College Physics (14 Gradeboo

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Bookmarks Develop Window Help Cutnell, Physics, 10e College Physics (14 Gradebook ORION Downlondable eTextbook Focus on Concepts, Question 09 A race firshes at tht same place as it started. The contestants start from rest and oss the finish ine nnnng, which one ofth·foliowing the average velocity, and the average acceleration? Note that the symbol * means "not al to- about the Mege spee average speed " 0 m/s, average velocity-ons, average acceleration .m average speed 0 m/s, average velocity 0 m/s, average acceleration 0 m/s2 O average speed . 0 m/s, average velooty-0 m/s, average acceleration .m average speed . 0 m/s, average vesooty * 0 ms, average acceleration .m average speed . 0 m/s, average velotym/s, average acceleration-o m Qen Show.work Click if you would like to Show Work for this question: sot,air Question Attempts0of used Air

Explanation / Answer

# B IS CORRECT

#Average speed is distance travelled/time .Since the runner travelled the distance it can not be zero. Hence average speed is non zero.

Average velocity is vector quantity. It's defined as displacement/time. But displacement is (final position - initial position)/time. So displacement is zero. Hence velocity is also zero.

Average acceleration is (final velocity - initial velocity)/time . Runner start from rest (zero velocity) and ends running. It means there is change in initial and final velocity. Hence acceleration is non zero.

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