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Homework Help: Simple Momentum Question

  1. Oct 23, 2009 #1
    1. The problem statement, all variables and given/known data
    A 24.0kg dog running at a speed of 3.0m/s jumps onto a stationary skateboard that has a mass of 3.6 kg how long will it take a force with a magnitude of 9.0 N to stop the skateboard and the dog?

    2. Relevant equations
    F(change in time)=Pf-Pi

    3. The attempt at a solution
    I dont understand how to calculate the length of time that it takes for the 9.0N force is going to slow down the skateboard and the dog.
  2. jcsd
  3. Oct 23, 2009 #2


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    Homework Helper

    You can use the formula you wrote: F(change in time)=Pf-Pi
    Put in the numbers for the force and momentum and then you can calculate the change in time.
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