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Very basic acceleration question (typo?)

  1. Jun 25, 2007 #1
    An object starts at time t = 0 with a velocity of v = +4 m/s and undergoes a constant acceleration of a = -15 m/s2
    At what time does the speed of the object reach zero?

    vf = vi + a t
    so delta t = 0 - 4 / -15

    = .27 seconds

    apparentrly this is wrong answer, but I cant see why? seems really simple!

    I am suspecting that this question had a typo in it?

    Sorry, please disregard, it was sig dig problem
    should be .267 seconds!
  2. jcsd
  3. Jun 25, 2007 #2
    Thanks for posting this in the Homework Help section mujadeo.
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