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13 June, 11:09

A car is going 7 m/s when it begins to accelerate. Sixty meters further down the road, the car is going 24 m/s. a) What was the acceleration of the car? b) How much time did the change from 7 m/s to 24 m/s take?

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  1. 13 June, 13:44
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    acceleration = 4.4 m/s²

    time is 3.86 s

    Explanation:

    given data

    initial speed = 7 m/s

    final speed = 24 m/s

    distance = 60 m

    to find out

    acceleration and time when change speed change

    solution

    we will apply here equation of motion for acceleration

    v²-u² = 2*a*s ... 1

    here v is final speed and u is initial speed and s is distance and a is acceleration

    put here all these value

    24²-7² = 2*a*60

    so

    a = 4.4

    acceleration = 4.4 m/s²

    and

    now find time by equation of motion

    v = u + at

    put her value

    24 = 7 + 4.4 (t)

    t = 3.86

    so time is 3.86 s
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