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    babybop09's Avatar
    babybop09 Posts: 1, Reputation: 1
    New Member
     
    #1

    Nov 6, 2011, 09:12 AM
    transpose the formula v = u + at to make a the subject?
    transpose the formula v = u + at to make a the subject

    Find the value of a in m/s2 when u = 18 m/s, v = 27 m/s, t = 10 s
    jcaron2's Avatar
    jcaron2 Posts: 986, Reputation: 204
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    #2

    Nov 6, 2011, 08:23 PM
    You can figure this out, babybop. I'm assuming you missed a plus sign in there, so it should read



    So how do you get a by itself? It's just simple algebra; you've probably been doing this for a couple years now. You can start by subtracting u from both sides. That gives you



    Now there's just one more step to get a all alone. Can you handle the last step?

    As for finding the value in m/s^2, that's just a matter of plugging in the numbers you're given.
    berry9467's Avatar
    berry9467 Posts: 2, Reputation: 1
    New Member
     
    #3

    Aug 22, 2012, 03:38 AM
    Please correct me if I get this wrong because I'm just starting to learn the basics of motion at school.
    The formula I used is:
    a=(v-u)/t
    As for answering the question
    a=(v-u)/t
    a=(27-18)/10
    a=-1ms^1
    Which means it's decelerating at 1 meter every second.
    I hope that helped, like I said before if I'm wrong then please correct me because I do not want to confuse others :)
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #4

    Aug 22, 2012, 06:00 AM
    Berry9467: your answer is not quite right. Given v = final velocity = 27 m/s, u = initial velocity = 18 m/s, t = time = 10 s, and assuming acceleration is constant:



    Note that the acceleration here is positive, and the correct units are meters per second squared.

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