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Homework Help: Collision help

  1. Nov 20, 2013 #1
    1. The problem statement, all variables and given/known data
    (Diagram of problem is given in attachment)
    m2 is stationary
    The coefficient of kinetic friction on m2 is 0.2 while the ground below m2 has a coefficient of friction of 0.

    a) Find the final velocity of both objects if m1 moves at the same v as m2

    b)Find the minimum length of m2

    2. Relevant equations

    mv = p (Momentum)

    3. The attempt at a solution

    m1v1 = m1v1' + m2v1'
    m1v1 = 50v1'
    (10)(20) = 50v1'
    200/50 = v1'
    v1 = 4m/s

    I was able to calculate the final velocity of the two objects using conservation of momentum but I have no clue how to calculate the minimum length of m2.

    Attached Files:

    Last edited: Nov 20, 2013
  2. jcsd
  3. Nov 21, 2013 #2
    m1 is slowed down from 10 to 4 meters per second on m2 while m2 is speeding up from 0 to 4 m/s. At that point they are moving together.
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