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Homework Help: Simple Kinematics

  1. Apr 16, 2007 #1
    Don't know what I am doing wrong

    An adventurous dog 7.50 kg dog runs onto a frozen, frictionless pond with an initial velocity of 4.31 m/s along the positive x-axis. The dog slides across the ice while being pushed by a steady wind with a force of 16.1 N in the positive y-direction. What is the magnitude of the dog's displacement (relative to where he came onto the ice) after 2.55s?

    Can't I just use, Xf=Xi + Vixt + 0.5a(t^2) and Yf=Yi + Viyt + 0.5a(t^2)
  2. jcsd
  3. Apr 16, 2007 #2
    post a little more work, maybe.

    x(t) is simple and uses one term.
    y(t) is same, but diff terms.

    displacement is not x(t)+y(t), however, in case that's what was assumed.
  4. Apr 16, 2007 #3

    Doc Al

    User Avatar

    Staff: Mentor

    Sure. That will give you the components of the displacement, if you use the correct initial values and accelerations. What did use? Hint: Each component has a different acceleration and initial speed.
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