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Homework Help: Momentum on an incline

  1. Mar 7, 2010 #1
    1. The problem statement, all variables and given/known data

    A 20-newton force pulling an object up a hill at a constant rate of 2 m/s. The diagram shows a box that is 5 kg on an incline that is 30 m long and 10 m high.

    the answers are
    1) 0 kg-m/s
    2) 10 kg-m/s
    3) 100 kg-m/s
    4) 600 kg-m/s

    The equation for momentum is p=mv

    2. Relevant equations



    3. The attempt at a solution

    so wouldn't i just do
    (5 Kg)(2 m/s)= 10 kg-m/s
     
  2. jcsd
  3. Mar 7, 2010 #2

    lightgrav

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    Homework Helper

    yes, if the question is "what is the magnitude of the momentum"
    ... but for "what is the rate of change in momentum", the answer is different .
     
  4. Mar 7, 2010 #3
    yes it was what is the magnitude of the momentum?
    thank you :)
     
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