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: Constant Acceleration Car

  1. Jan 13, 2008 #1
    [SOLVED] Constant Acceleration

    1. The problem statement, all variables and given/known data
    a. What constant acceleration, in SI units, must a car have to go from zero to 60 mph in 10s?

    b. What fraction of g is this?

    c. How far has the car traveled when it reaches 60 mph? Give your answer both in SI units and in feet.

    2. Relevant equations

    3. The attempt at a solution
    I have gotten answers for parts a and b, but I get really confused on part c.

    For a: 1 mph = .447 m/s, so 60(.447)=26.82 m/s. (26.82 m/s)/(10s)=2.68 m/s^2

    For b: g=gravity=9.8 m/s^2. (2.68 m/s^2)/(9.8 m/s^2)=.273(100)=27.3%

    For c: I'm not sure where to start to find my answer.

    I appreciate any help!

    I just solved it! I've worked on part C for about 45 minutes to an hour. I just found an equation that worked, imagine that.

    For c: I used d=Vi(t)+0.5(a)(t^2) So, d=(0 m/s)(10 s)+0.5(2.68 m/s^2)(10^2)=134 m. Then to convert 134 m to feet = 134(39.37)=5,275.58 in/12=440 ft

    Hopefully this will help someone else out that is new to physics, like myself.
    Last edited: Jan 13, 2008
  2. jcsd
  3. Jan 13, 2008 #2


    User Avatar
    Homework Helper

    use one of them there equations from your textbook:
    x = \frac{1}{2}a t^2 + v_0 t + x_0
  4. Jan 13, 2008 #3
    This is the exact equation I used! Please see the bottom of my previous post, I just finished editing my initial post. I appreciate your help, all of the great help I've received from this forum!
  5. Jan 13, 2008 #4


    User Avatar
    Homework Helper

    ah. well, that's good.
  6. Jan 14, 2008 #5
    Yeah and hopefully your teacher can help... oh wait....
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook