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Home > Science > Physics   »   Average Speed

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Old Jun 11, 2007, 02:02 AM
deepak manchanda
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Average Speed
A body covers half a distance with a speed of 20m/s and the other half with a speed of 30m/s.Find the average speed of the whole journey?

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Old Jun 11, 2007, 06:27 AM   #2  
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25m/s

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Capuchin disagrees: Sorry colb, It doesn't work like that.
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Old Jun 11, 2007, 08:07 AM   #3  
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deepak, consider a test piece of road. A good length of road to choose would be one that is easily divisible by both your speeds, like 120m.

so he travels 60m at 20m/s and 60m at 30m/s

what is the total time he takes? what is the total distance? therefore what's his average speed?

let me know if you have any trouble.
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Old Jun 11, 2007, 12:34 PM   #4  
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ah thanks for the explanation, see where my "expert" guess falls down!
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