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Homework Help: Forces and motion

  1. Oct 18, 2007 #1

    I am trying to help my brother do this problem but I can't figure it out! can anyone please help me...

    A 3.45 kg object is moving in a plane, with its x and y coordinates given by x = 7t² - 3 and y = 4t³ + 3, where x and y are in meters and t is in seconds. Find the magnitude of the net force acting on this object at t = 2.35 s.

    thank you so much
  2. jcsd
  3. Oct 18, 2007 #2

    Doc Al

    User Avatar

    Staff: Mentor

    Hint: Newton's 2nd law.
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