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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

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    Staff: Mentor

    Start by figuring out the distance she needs to come to a stop. (Use one of the equations you posted.)
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