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HELP -How many meters does it take for a car to stop?

  1. Sep 22, 2009 #1
    A race car can be slowed with a constant acceleration of -11 m/s squared
    If the car is going 45 m/s, how many meters will it take to stop?
    How many meters will it take to stop a car going half as fast?
     
  2. jcsd
  3. Sep 22, 2009 #2

    rock.freak667

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    Look up the kinematic equations of motion
     
  4. Sep 22, 2009 #3
    1. what are those
    2. i dont know how that helps.. all i need is an answer
     
  5. Sep 22, 2009 #4

    rock.freak667

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    http://www.glenbrook.k12.il.us/GBSSCI/PHYS/Class/1DKin/U1L6a.html [Broken]

    PF doesn't work like that. We will help you arrive at the answer.
     
    Last edited by a moderator: May 4, 2017
  6. Sep 22, 2009 #5
    ok well i do not know what type of formula, how do i get it?
     
  7. Sep 22, 2009 #6

    rock.freak667

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    Read the link I posted and see which variables you have in your problem.
     
  8. Sep 22, 2009 #7
    thank you for the link, but none of those equations work, there is no time involved in the situation. Are there any other ways, I'm looking for how many meters it will take for the car going 45m/s to stop at the constant rate of -11m/s squared
    anything else, please?
     
  9. Sep 22, 2009 #8
    Your observation that you do not need time to solve the problem is correct. The observation that all those equations involve time is not- look carefully.
     
  10. Sep 22, 2009 #9
    thank you so much.
     
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