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19 September, 21:56

It takes a truck 3.56 seconds to slow down from 112 km/h to 87.4 km/h. What is its average acceleration?

1.92 m/s2

-1.92 m/s2

-6.81 m/s2

6.81 m/s2

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Answers (1)
  1. 19 September, 22:38
    0
    option B

    -1.92 m/s2

    Explanation:

    Given in the question,

    time took by truck to slow down = 3.56 sec

    initial speed of truck = 112 km/h

    final speed of truck = 87.4 km/h

    1 km/h = 0.277778 m/s

    112 = 31.1 m/s

    87.4 = 24.28 m/s

    Formula use to calculate the acceleration

    v - u = at

    where v is final speed

    u is initial speed

    a is acceleration

    t is time

    plug values in the equation

    24.28 - 31.1 = a (3.56)

    -6.8 = a (3.56)

    a = - 6.8 / 3.56

    a = - 1.9 m/s²
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