Lucy moves down the hall at 3.5 m/s. When he sees Luke coming, he slows down. After 4.0 s, he is moving at 2.1. m/s. What is his acceleratio

Question

Lucy moves down the hall at 3.5 m/s. When he sees Luke coming, he slows down. After 4.0 s, he is moving at 2.1. m/s. What is his acceleration?​

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Thiên Di 3 years 2021-08-18T13:24:04+00:00 1 Answers 1 views 0

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  1. nguyetanh
    0
    2021-08-18T13:25:35+00:00
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    Answer:

    Acceleration, a = 0.35 m/s²

    Explanation:

    Given the following data;

    Initial velocity, u = 3.5 m/s²

    Final velocity, v = 2.1 m/s²

    Time, t = 4 secs

    To find the acceleration, we would use the first equation of motion;

    V = u – at (the sign is negative because Lucy is slowing down).

    Substituting into the formula, we have;

    2.1 = 3.5 – a(4)

    2.1 = 3.5 – 4a

    4a = 3.5 – 2.1

    4a = 1.4

    a = 1.4/4

    a = 0.35 m/s²

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