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: Minimum deaceleration untll the car stops

  1. Sep 12, 2006 #1
    what am i doing wrong??
    every time i try to answer this i get t=.2s and a=-1651ms^-2

    the problem reads....
    A car traveling at 25mi/h is to stop on a 35m-long shoulder of the road. (a) What is the required magnitude of he minimum acceleration? (b)How much time will elapse during this minimum deaceleration untll the car stops.

    i used the equation....

  2. jcsd
  3. Sep 12, 2006 #2
    i think the first time is to convert 25mi/h into meters per second.

  4. Sep 13, 2006 #3
    Yes, use 1 mile =1.6km, and don't forget to convert to m/s, so you need to change out of km/h. 1h=3600s. That equation is right.
  5. Sep 17, 2006 #4
    yes i did convert to m/s wrong thanks for the help.:rofl: :tongue2:
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook