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November 15th, 2013, 04:25 PM   #1
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Magnitude of Acceleration

Just a basic question, I'm wondering if there is a formula so I can use it for harder questions.

A car accelerates along a straight road from rest to 75 km/h in 5 secs. What is the magnitude of
its average acceleration?

All I did was 75/5 =15, converted 15km into metres, so 15000, then divided by 60 (minutes)=250, then divided by 60(seconds) to get 4.16.

But is there a different/simpler way to do this so I can apply it to more difficult questions?
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November 16th, 2013, 01:07 PM   #2
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Re: Magnitude of Acceleration

The bulk of your calculation involved unit conversion. The only way to simplify is to set up a table of conversion factors.
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acceleration, magnitude

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