Question 391548
I'm not sure how to help my son with this question.  Been out of school too long and any help is appreciated.

What is the greater acceleration rate?  A runner who can go from 0 m/s to 12 m/s in 10.0 seconds, or a runner who can go from 0 mi/h to 18 mi/h in 10.0 seconds?
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When you compare,  the units have to be the same in both cases.
In the second one it is 18 mi/h
lets convert this to m/s
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1 mile = 1609.34 meters
1 hour = 3600 seconds
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18 mi /h= (18 * 1609.34) meters /3600 seconds
= 8.046 m/s
one is 12 m/s and the other is 8.046 m/s. in 10 seconds
you can decide I am sure
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m.ananth@hotmail.ca