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Finding Velocity given the initial velocity and weight

  1. Jun 29, 2014 #1
    1. The problem statement, all variables and given/known data
    An 80-kilogram man jumps off a raft that weighs 100 kg. His initial velocity from jumping is 7 meters per second. Assuming that the friction resistance of the water is zero, the velocity of the raft after the man jumps will be?


    2. Relevant equations
    Vf^2= Vi^2 + 2aD

    3. The attempt at a solution
    I am trying to figure out the velocity of that raft after the man jumps, the question is confusing me on which variable I need to solve the problem. Any help?
     
  2. jcsd
  3. Jun 29, 2014 #2

    Nathanael

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    Homework Helper

    Do you know about conservation of momentum?
     
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