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19 June, 09:29

While passing a slower car on the highway, i accelerate uniformly from 12 m/s to 24 m/s in a time of 10.0s. How far do you travel during this time and what is the magnitude of your acceleration

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  1. 19 June, 09:33
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    You say that there is uniform acceleration so:

    vf-vi=at (final velocity minus initial velocity is equal to acceleration times time)

    We know vf, vi, and t so we can solve for acceleration:

    24-12=a10

    12=10a

    a=1.2

    That is the acceleration, we will need to integrate with respect to time twice ...

    v=⌠a dt

    v=at+vi, we know a=1.2m/s^2 and vi=12m/s

    v=1.2t+12,

    x=⌠1.2t+12 dt

    x=1.2t^2/2+12t+xo, we can just let xo=0 for this problem ...

    x (t) = 0.6t^2+12t

    Now we know that this acceleration lasts for 10 seconds so the distance traveled in that time is:

    x (10) = 0.6 (10^2) + 12 (10)

    x (10) = 60+120

    x (10) = 180 meters
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