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Kinematics Problem -- 3 particles at the vertices of an equilateral triangle

  1. Oct 3, 2014 #1
    Here's the question:

    Three particles A, B and C are situated at the vertices of an equilateral triangle ABC of side d at time t = 0. Each of the particles moves with constant speed v. The particle at A always has its velocity along AB, B along BC and C along CA. At what time will the particles meet?

    And here's what I don't understand - If each particle is restricted to its corresponding side of the triangle, how exactly will they "meet"?
  2. jcsd
  3. Oct 3, 2014 #2
    The sides of the triangle are getting smaller.
  4. Oct 3, 2014 #3

    Doc Al

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    Staff: Mentor

    It's a bit oddly worded. Don't think in terms of fixed directions based on the original positions. As the particles move and change position: A always moves toward B, B always moves toward C, C always moves toward A.
  5. Oct 3, 2014 #4
    You were right. That cleared a lot up. Thanks!
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