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Homework Help: Basic Kinematic to Find Distance

  1. Apr 1, 2012 #1
    1. The problem statement, all variables and given/known data

    A skier reaches a speed of 56 m/s on a 30° slope w/ no friction. What is the minimum distance the skier would have to travel if starting from rest.

    2. Relevant equations

    Vf2 = Vi2 +2(a)(Δd)

    3. The attempt at a solution

    I hope no one will scoff too hard, this is my first physics class. I made up a mass of 10kg and calculated the weight in x direction with Wx = W(sin(30))= 98.1N, normal force in x is zero.

    Then I found weight in y direction with Wy = W(cos(30))= -85.0N

    From there I used ƩFx=M(ax) and came out with ax=4.91 m/s2 and came to a final solution of ≈320m after filling in the kin. equation.

    I spent over an hour on this and feel like I may have just made up nonsense and then "math'd" it. Could someone kindly check my work and give me some guidance?

  2. jcsd
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