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September 30, 2014

September 30, 2014

Posted by **Kayla** on Monday, September 13, 2010 at 10:54pm.

- Physics -
**drwls**, Monday, September 13, 2010 at 11:11pmWhat you DON'T do is average the three velocities. The number you gat will be close (in this case), but it won't be correct.

The total distance run is 300 x 3 = 900 m

The times required by the runners are

300/7.3, 300/7.2 and 300/7.8 s. That is 41.10, 41.67 and 38.46 s. The total time is 121.23s. Divide the total distance by that total time to get the everage speed.

I get about 7.424 m/s

The average of the three speeds is 7.433 m/s

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