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22 September, 06:06

At the starting gun a runner accelerates from rest at 1.7 m/s^2 for 2.2 What is the runner's speed 1.3 s after she starts running?

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  1. 22 September, 09:58
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    The runner's speed is 2.2 m/s after 1.3 s.

    Explanation:

    The acceleration is the variation of velocity over time. If the acceleration is constant, then:

    dv/dt = a

    Separating variables:

    dv = a · dt

    integrating from initial velocity (v0) to v and from t = 0 to t:

    v - v0 = a · t

    v = v0 + a · t

    Then usign this equation, we can calcualte the speed at t = 1.3 s:

    v = 0 m/s + 1.7 m/s² · 1.3 s

    v = 2.2 m/s

    The runner's speed is 2.2 m/s after 1.3 s.
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