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B (Vector)How can i find the force ? Please help~

  1. Dec 11, 2016 #1
    Hi~ everyone

    How can i find the force in Q(a)(ii)?
    i know how to find the force with angle but i dont this one
    please help ~
    WhatsApp Image 2016-12-11 at 9.58.01 PM.jpeg
  2. jcsd
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