Average speed

Samis454 · #1 Jan 15, 2009, 06:31 PM

For each of the distances, find the average speed of the world champion runner.

Distnace Time
100m 9.8 seconds
400m 43.2sec
800m 1 min 41 sec
1,500m 3 min 26 sec

PLEASE HELP

nike 1 · Jan 15, 2009, 06:40 PM

Divide meters by seconds. You will come up with meters run per second. Now do the math.

nike 1 · Jan 20, 2009, 06:06 PM

Not very nice kid. I was only trying to help.

sarnian · Jan 20, 2009, 06:33 PM

Samis : so you need the average speed :
Way to get there : The average speed = meters per second (or kilometers per hour).

Distance = 100m , and time = 9.8 seconds
You have the distance per 9.8 seconds. But for average speed you need the distance per 1 second.
So divide both terms with a factor 9.8 here, and you get ....

Distance = 1500m , and time = 3 min 26 sec
How many sec = 3 min 26 sec ?
Than divide 1500 by the number of sec and again you have the average speed

Etc. , etc. etc.

Always be nice to those who try to help you ....



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