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Homework Help: Linear Motion -Velocity and Acceleration

  1. Jan 30, 2008 #1
    Linear Motion --Velocity and Acceleration

    1. The problem statement, all variables and given/known data
    [10] A toy car travels along a straight line. Its position x varies with time as shown on the x-t graph. The equation of motion in the A-C interval is given by


    where alpha=1.0 m, beta=1.3 m/s^2 and y=0.3 m/s^(1/2) . The curve in the interval C-E is a symmetric parabola, and the graph in the E-G interval is linear.

    a) Write the equations for v(t) and a(t)  in the A-C interval. Calculate the velocity in point C.
    b) Calculate the accelerations in the intervals C-D and D-E, and the position in point D.

    2. Relevant equations

    There is a graph but I do not know how to show it.

    3. The attempt at a solution
    I really just want to make sure I am starting this correctly. For part (A) I filled in the given values and then took the first and second derivative to find the the velocity and the acceleration. Is that correct for this problem? The second part of a A asks for the velocity at C. "t" at "C" equals one so I took v(1). The answer I worked out was v(1)=(-2.6m/s^2)+(0.15m/s^(1/2)). This doesn't seem right to me. Could someone check to see if I am doing this the correct way? I do not know how to proceed at all with part B, so I would greatly appreciate a little direction.
    Thank you.
  2. jcsd
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