Carl Lewis set a world record for the 100.0-m run with a time of 9.86 s. If, after reaching the finish line, Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0 m?
10.1 m/s
1.10 m/s
5.60 m/s
1.98 m/s
0 m/s

Question

Carl Lewis set a world record for the 100.0-m run with a time of 9.86 s. If, after reaching the finish line, Mr. Lewis walked directly back to his starting point in 90.9 s, what is the magnitude of his average velocity for the 200.0 m?
10.1 m/s
1.10 m/s
5.60 m/s
1.98 m/s
0 m/s

danjs · Answer

What is the definition of average velocity?

danjs · Answer

You could say
$$ave~velocity  =<v> = \frac{ net~displacement }{ time taken }$$

danjs · Answer

He started at the Start line, and ended at the Start Line.. his Net displacement will be Zero so the average velocity will be 

(+100m - 100m) / ( 90.9 + 9.86s)  =  0   m  /s