A car is travelling along a straight road at 8 m/s. It accelerates ( gia tốc ) at 1 m/s^2 for a distance of 18 m. How fast is it then travelling ? Giú

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A car is travelling along a straight road at 8 m/s. It accelerates ( gia tốc ) at 1 m/s^2 for a distance of 18 m. How fast is it then travelling ?
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  1. Đáp án:

    After the acceleration the car will travel at a speed of 10m/s

    Giải thích các bước giải:

    We have:

    $\begin{array}{l}
    {v^2} – {v_o}^2 = 2as\\
     \Leftrightarrow {v^2} – {8^2} = 2.1.18\\
     \Leftrightarrow v = \sqrt {{8^2} + 36}  = 10m/s
    \end{array}$

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