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Answered

Which of the following best represents the average speed of a fast runner?


10 meters per second


10 miles per minute


10 centimeters per hour


10 kilometers per second

Verified Answer :

MissPhiladelphia

For the answer to the question above, the easiest way to determine is changing every runner's speed into the same unit.

First = 10 m/s 

Second = 10 miles/min = 16090.34 / 60 m/s (As 1 mile = 1609.34 meter and 1 min = 60 sec) 
Second = 260.82 m/s 

Third = 10 cm/hr = 10(0.01)/6060 (As 1 cm = 0.01 m and 1 hr = 6060 sec) 
Third = 0.000028 m/s 

Fourth = 10 km/sec = 101000 m/s (As 1 km = 1000 m and time is already in sec) 
Fourth = 10000 m/s 

So fastest would be the one who covers the largest distance in 1 sec. It would be the fourth one.

elemental

the one above is incorrect the real answer is 10 meters per second and you don't really need an equation for this (it's pretty obvious ) :)

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