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: Car collision

  1. Feb 9, 2008 #1
    A person who is properly constrained by an over-the-shoulder seat belt has a good chance of surviving a car collision if the deceleration does not exceed 30 "g's" (1.00 g = 9.80 m/s^2). Assuming uniform deceleration at this rate, calculate the distance over which the front end of the car must be designed to collapse if a crash brings the car to rest from 100km/h.

    I'm not sure how to get this problem started, any help would be greatly appreciated.
  2. jcsd
  3. Feb 9, 2008 #2


    User Avatar
    Science Advisor
    Homework Helper

    Acceleration is just change in speed divided by time.
    You probably want the equation v^2 = u^2 + 2 a s
    Where V is the final and u the intial speed, a is acceleration and s is distance.
    Be careful about the sign of the acceleration.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook