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Homework Help: Pully Question

  1. Jun 25, 2010 #1
    1. The problem statement, all variables and given/known data
    Ok so a 25kg mass is lowered by a rope. If the velocity of the mass is decreasing at a rate of 5m/s(squared), what is the tension in the rope?


    2. Relevant equations

    T-mg=ma
    T-mg= -ma

    3. The attempt at a solution I solved for the 1st equation to get the answer of 375N. My question is conceptual. I reasoned that since the velocity is negative and the mass is slowing down than the acceleration must be positive just like when are car slows down when moving to the left. Is this correct.
     
  2. jcsd
  3. Jun 25, 2010 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Perfectly correct.
     
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