1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Race Car Driving

  1. Aug 30, 2010 #1
    1. If your car goes from 0 mi/h to 40 mi/h in
    5 s, what is your average acceleration?
    Answer in units of
    miles
    h · s



    2. i think i multiply 40 times the 5 and then the answer by something else. i'm not too sure
     
  2. jcsd
  3. Aug 30, 2010 #2

    berkeman

    User Avatar

    Staff: Mentor

    The acceleration will be the change in velocity, divided by the time it took to change that velocity. Think of it this way -- the smaller the time, the higher the acceleration, right?

    Now what do you think you do to get the answer?
     
  4. Aug 30, 2010 #3
    then i just divide 40 by 5 right?
     
  5. Aug 30, 2010 #4

    berkeman

    User Avatar

    Staff: Mentor

    Yes. The mixed units for the answer that they ask for are quite strange, and you normally would not leave your answer in mixed units, but they seem to be doing that just to make it easier for you to do the first steps of the math.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook