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: Linear motion Problem. Help!

  1. Sep 10, 2008 #1
    A ranger in a national park is driving at 28.0 mi/h when a deer jumps into the road 155 ft ahead of the vehicle. After a reaction time t, the ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the maximum reaction time allowed if she is to avoid hitting the deer?

    V^s=(Vo)^2+2a(delta x)

    28.0 mi 5280 ft 1 hr = 41.06667ft/s
    1 hr 1 mi 3600 s
  2. jcsd
  3. Sep 10, 2008 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Start by figuring out the distance she needs to come to a stop. (Use one of the equations you posted.)
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook