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Homework Help: Calculating acc. from the given data

  1. Apr 11, 2012 #1
    1. The problem statement, all variables and given/known data

    A car moving with uniform acceleration covers 450m in a 5 second interval, and covers 700m in the next 5 seconds interval. The acceleration of the car is ?

    2. Relevant equations

    3. The attempt at a solution

    please correct me if i am wrong, i calculate velocity at the end of the first run i.e. v1= 450/5= 90m/s . And then at the end of 2nd run v2= 700/5 = 140 m/s. Then i apply,
    Acceleration =change in velocity upon time period i.e. (140-90)/5 = 10m/s^2 , right?
    Thank you.
  2. jcsd
  3. Apr 11, 2012 #2


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    Science Advisor
    Homework Helper

    hi jatin1990! :smile:
    nooo, that gives you the average velocity, which doesn't help much :redface:

    you'll probably need two constant acceleration equations, one for each time period

    (you may find it easier to put t = 0 in the middle, so that the two end-times are ±5 s :wink:)
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