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August 29, 2014

August 29, 2014

Posted by **George** on Saturday, January 10, 2009 at 6:30pm.

Is the answer 3.7

- Physics -
**drwls**, Saturday, January 10, 2009 at 6:57pm1 what behind the leader? 1 km? I will assume so. After 35 minutes, runner 1 would then have 1 km to go and runner 2 would have 2 km to go. The race will be over in 1 km/(9 km/35 min) = 35/9 = 3.89 minutes. Runner 2 must have an average speed over the last 2 km of

2km/3.59 min = 0.557 km/min to catch up. He started the "finishing kick" at a speed of 8 km/35 min = 0.229 km/min and will have to end it at 0.656 km/min. Such a speed is not humanly possible.

I will leave you to compute the required acceleration. (A 0.427 km/min increase in speed in 3.89 minutes)

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