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    A car accelerates uniformly from 5m/s to 20m/s over a distance of 500m.
    a. How long does this take?
    b. What is the car's acceleration?


    Can somebody help me on this? A-Level Physics has been blessed to me with a bad teacher who's not very good at explaining things. Either that or I'm just stupid.

    Please help?
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    first one use s = ut + 1/2 at^2

    second one use v = u + at
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    (Original post by Gwenuin)
    first one use s = ut + 1/2 at^2

    second one use v = u + at
    Okay, yes, I've tried this.

    I say tried, but I kinda need it explaining to me because I'm in need of help and I'm shameless.

    If I need t - and to get t I need a - how would I go about this using the formula?

    Because to get a I need t, or so I can tell.

    Am I just being stupid?
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    My bad, I meant v^2 = u^2 + 2as for the first one!

    This is kinda a bad question because you have to do part b first in order to work out part a.

    Basically you have two unknowns, you need to find an equation where you know everything apart from one unkown (hence v^2 = u^2 + 2as)
 
 
 

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