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Momentum, Impulse and Collisions

  1. Mar 26, 2015 #1
    1. The problem statement, all variables and given/known data
    Two hockey players push each other on the ice. The 86-kg skater moves with a velocity of 2.4 m/s. Find the recoil velocity of the 79-kg skater

    2. Relevant equations
    idk

    3. The attempt at a solution
    86*2.4=79*v2 v2=2.613 m/s

    Second problem
    1. The problem statement, all variables and given/known data
    A child drops a 5-g marble on the floor. The marble hits the floor with a velocity of -3.13m/s and rebounds with a velocity of 1.87 m/s. What is the marble's change in momentum? What impulse acts on the marble? What is the force of impact if the marble is in contact with the floor for a time of 2.5 x 10^-3s?

    2. Relevant equations
    idk
    3. The attempt at a solution
    A) (5*1.87)-(5*-3.13)
    B)
    C)(5*-3.13)/(2.5*10^-3)=-6260N
     
  2. jcsd
  3. Mar 26, 2015 #2

    haruspex

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    Can you not express the principle you used below in general terms?
    Units?
    Are you stuck on this?
    You need to use the result from A/B
     
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