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Use the Impulse-Momentum Theorem

  1. Dec 6, 2009 #1
    1. The problem statement, all variables and given/known data
    Use the impulse-momentum theorem to find how long a stone falling straight down takes to increase its speed from 4.8 m/s to 10.7 m/s.

    I really don't get the question. How could we find the time in second if we only know the initial and final velocity.

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Dec 6, 2009 #2


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    I am going to consider this an attempt at a solution, and offer a hint: You also know the acceleration.

    Also, the impulse-momentum theorem is definitely a relevant equation here.
  4. Dec 6, 2009 #3
    How do we find the acceleration if we don't know the time interval?
  5. Dec 6, 2009 #4
    Force*time=m(Vf-Vi) solve for time. Force is obviously gravity=mg
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