12. A car is travelling at 30 m/s when the driver sees a red light in the distance and immediately applies the brakes. The car comes to a st

Question

12. A car is travelling at 30 m/s when the driver sees a red light in the distance and immediately applies the brakes. The car comes to a stop 1.5 s later. How far did the car move from the time the driver applied the brake to when it came to a stop?​

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Ngọc Diệp 4 years 2021-07-19T05:28:27+00:00 1 Answers 10 views 0

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  1. thnahdat
    0
    2021-07-19T05:29:48+00:00
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    Answer:

    22.5 m

    Explanation:

    From the question given above, the following data were obtained:

    Initial velocity (u) = 30 m/s

    Time (t) = 1.5 s

    Final velocity (v) = 0 m/s

    Distance (s) =?

    The distance to which the car move before stopping from the time the driver applied the brake can be obtained as follow:

    s = (u + v)t/2

    s = (30 + 0)1.5 / 2

    s = (30 × 1.5) / 2

    s = 45 / 2

    s = 22.5 m

    Thus, the car will move to a distance of 22.5 m before stopping from the time the driver applied the brake.

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