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November 01, 2025, 09:35:20 am
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Author Topic: Quick acceleration Q  (Read 1081 times)  Share 

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TonyHem

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Quick acceleration Q
« on: March 02, 2009, 03:39:35 pm »
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A car travels from rest with uniform acceleration for 18.5 seconds. It travels a distance of 400m. What is it's acceleration?
Ive got two different answers and I can't tell why they should be different.
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kaanonball

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Re: Quick acceleration Q
« Reply #1 on: March 02, 2009, 03:53:18 pm »
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what answer did you get?
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TonyHem

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Re: Quick acceleration Q
« Reply #2 on: March 02, 2009, 03:54:44 pm »
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I got 2.34

Everyone else did V = DT = 400/18.5 V = 21.62ms^-1
and did A = changein velocity/ change in time which
               = 1.16ms^-2

And I dunno why they should be different.
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kaanonball

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Re: Quick acceleration Q
« Reply #3 on: March 02, 2009, 05:56:13 pm »
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Considering the question includes the term uniform acceleration i would think it would be more appropriate to use formula's which relate uniform acceleration to the other variables given.
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Flaming_Arrow

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Re: Quick acceleration Q
« Reply #4 on: March 02, 2009, 06:50:49 pm »
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you can only use x = ut if a=0 in other words, if there's contant speed/velocity.
« Last Edit: March 02, 2009, 07:00:35 pm by Flaming_Arrow »
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