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Homework Help: 3 masses connected by a pulley

  1. Sep 19, 2007 #1
    1. The problem statement, all variables and given/known data

    The three blocks shown are relased at t=0 from the position shown in the figure. Assume that there is no friction between the table and M2, and that the two pulleys are massless and frictionless. The masses are: M1 = 3.0 kg, M2 = 7.0 kg, M3 = 5.0 kg.

    Calculate the speed of M2 at a time 1.35 s after the system is released from rest.


    2. Relevant equations
    I figure I need an equation with time like V= Vo +at and then I also need to use an equation to solve for a. I know all of the a's are equal (a1=a2=a3), yet I do not know which equation to use.

    3. The attempt at a solution
    for the first equation I plugged in V=Vo +at, t was the 1.35s, Vo = 0, v is unknown, and a I am unsure how to get still? Could you please help me out?
  2. jcsd
  3. Sep 19, 2007 #2


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    Not able to see the picture.
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