1. Not finding help here? Sign up for a free 30min 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!

Cars, Energy, and Work

  1. Nov 12, 2004 #1
    If it takes 50 m to stop a car initially moving at 25 m/s, what distance is required to stop a car moving at 50 m/s under the same condition?

    a. 50 m
    b. 100 m
    c. 200 m
    d. 400 m

    This is probably a really easy question, but I just can't see how to work it out. I tried to set up a ratio between the distance and velocity and that got me 100 m, but b is incorrect. Can anyone explain the correct method to do this problem and tell me why setting up a ratio between those 2 components is a mistake?
  2. jcsd
  3. Nov 12, 2004 #2
    Answer is C


    now you know the deceleration of the car

  4. Nov 12, 2004 #3
    Thanks. Is this the only way you can solve it?
  5. Nov 12, 2004 #4
    This is the way I would solve it. Hope others give some posts
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Cars, Energy, and Work
  1. Car - work (Replies: 2)