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posted by  gd_sd on 11/4/2009 8:22:41 PM  |  status: Closed  |  Earned Karma: 35

physics

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N/A N/A N/A N/A 11/5/2009 at 11:00:00 PM
Question Details:
A child on a sled starts from rest at the top of a 15.0° slope. If the trip to the bottom takes 17.3 s how long is the slope? Assume that frictional forces may be neglected.
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posted by jerry2009 on 11/4/2009 8:29:13 PM  |  status: Live
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Response Details:


    Let

    Angle of the inclined plane, θ = 15 o

    Time taken to reach bottom, t = 17.3 s

    Initial velocity, U = 0 m/s

    Acceleration, a = g sin θ

                           = 9.8 * sin 15

                           = 2.54 m/s^2

    Distance traveled along the plane, S = ?

    S = U t + ( 1/2 ) a t 2

       = 0 + 0.5 * 2.54 * 17.3 2

         = 380.1 m
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