A few days ago
Pr0ject

Physics Running directions?

A relay race is run along a straight-line track of length 300.0 m running south to north. The first runner starts at the south end of the track and passes the baton to a teammate at the north end of the track. The second runner races back to the start line and passes the baton to a third runner who races 100.0 m northward to the finish line. The magnitudes of the average velocities of the first, second, and third runners during their parts of the race are 6.94 m/s, 6.60 m/s, and 7.78 m/s, respectively. What is the average velocity of the baton for the entire race? [Hint: You will need to find the time spent by each runner in completing her portion of the race.]

I tried adding the 3 and /3 to find the average which was 7.1 but that did not work… any ideas?

Top 1 Answers
A few days ago
Anonymous

Favorite Answer

It’s easy, take the magnitude of each runner and divide it into 100. Add these 3 #’s together and you will have the total time it took for the 3 runners to complete the 300m relay. After you find the total time, divide that by 300 meters and you will have your avg velocity.

100/6.94=~14.4 sec

100/6.60=~15.2 sec

100/7.78=~12.9 sec

Total time = ~44.8 sec

300/44.8 sec = 6.69 m/s roughly

Edit: I didn’t account for sig figs so beware answer may be off a bit.

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