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Homework Help: Constraint equations

  1. Aug 16, 2015 #1


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    1. The problem statement, all variables and given/known data
    Block C is moving with a velocity v0 and block A and B are moving with velocities v1 and v2 with respect to block C. Find the relation between v0, v1 and v2

    2. Relevant equations

    3. The attempt at a solution
    Since the string is in-extensible, its velocity at both ends should be equal. So v1=v2
    But should i take the velocity with respect to earth instead of velocity with respect to block? Both gives me different answers.
    Last edited: Aug 16, 2015
  2. jcsd
  3. Aug 16, 2015 #2


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    Did you mean v1=v2?
    What do you think - should it be the speeds relative to the block that are equal or speeds relative to the ground?
  4. Aug 16, 2015 #3


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    The string itself has a velocity v0 if A and B are at rest. Then if A acquires a velocity v1, then B should also have a velocity v1.
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