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!

If she hits the brakes, how far will she travel before stopping?

  1. Sep 13, 2009 #1
    1. The problem statement, all variables and given/known data
    A person driving her car at 56 km/h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 30 m away from the near side of the intersection (Fig. 2-29). Should she try to stop, or should she make a run for it? The intersection is 15 m wide. Her car's maximum deceleration is -5.6 m/s2, whereas it can accelerate from 56 km/h to 70 km/h in 4.2 s. Ignore the length of her car and her reaction time. If she hits the brakes, how far will she travel before stopping?


    2. Relevant equations
    can someone at least give me a formula that i can use to find the answer??
    thankss
     
  2. jcsd
  3. Sep 13, 2009 #2

    rl.bhat

    User Avatar
    Homework Helper

    Refer any text book and list the kinematic equations.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: If she hits the brakes, how far will she travel before stopping?
Loading...