We'll use the kinematic equation:

$\overline{){{\mathbf{v}}}_{{\mathbf{f}}}{\mathbf{=}}{{\mathbf{v}}}_{{\mathbf{0}}}{\mathbf{+}}{\mathbf{a}}{\mathbf{t}}}$

$\overline{){\mathbf{\u2206}}{\mathit{x}}{\mathbf{=}}{{\mathbf{v}}}_{{\mathbf{0}}}{\mathbf{t}}{\mathbf{+}}\frac{\mathbf{1}}{\mathbf{2}}{{\mathbf{at}}}^{{\mathbf{2}}}}$

**(a)**

From the first equation:

An Olympic-class sprinter starts a race with an acceleration of 4.50 m/s^{2}. (a) What is her speed 2.40 s later? (b) Sketch a graph of her position vs. time for this period.

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What scientific concept do you need to know in order to solve this problem?

Our tutors have indicated that to solve this problem you will need to apply the Graphing Position, Velocity, and Acceleration Graphs concept. You can view video lessons to learn Graphing Position, Velocity, and Acceleration Graphs. Or if you need more Graphing Position, Velocity, and Acceleration Graphs practice, you can also practice Graphing Position, Velocity, and Acceleration Graphs practice problems.