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Homework Help: Energy and momentum problem

  1. Nov 25, 2012 #1
    1. The problem statement, all variables and given/known data
    Four 63kg bobsledders psuh their sled which has a mass of 210kg when empty. They start to push over a flat frictionless surface at an initial speed of 3m/s. At intervals of 2s, each bobsledder sprints forwards at a speed of 2m/s faster than the sled's current speed and then jumps in.

    What is the sled's final speed once everyone is in?

    2. Relevant equations

    3. The attempt at a solution
    m1 is sled's mass.
  2. jcsd
  3. Nov 25, 2012 #2
    V = 3 + 2 + 2 + 2 + 2 + 2 + 2

    I wrote down too many twos, how many?
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