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Homework Help: Conservation of Momentum

  1. Oct 25, 2011 #1
    A sled slides along a horizontal surface on which the coefficient of kinetic friction is 0.40. Its velocity at point A is 7.4 m/s and at point B is 3.0 m/s. Use the impulse-momentum theorem to find how long the sled takes to travel from A to B.

    (7.4)(.4)=2.96
    (3)(.4)=1.2

    (2.96)^2+(1.2)^2=10.2016

    √10.2016= 3.19

    But thats not the right answer
     
  2. jcsd
  3. Oct 25, 2011 #2
    I'm not really sure what you did..but try using the impulse momentum theorem and then remember that impulse=j=F*(delta t)
     
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