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20 June, 11:29

A driver notices an upcoming speed limit change from 45 mi/h (20 m/s) to 25 mi/h (11 m/s). If she estimates

the speed limit will change in 50 m, what acceleration is needed to reach the new speed limit before it begins?

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Answers (1)
  1. 20 June, 14:44
    0
    -2.79 m/s²

    Explanation:

    Given:

    v₀ = 20 m/s

    v = 11 m/s

    Δx = 50 m

    Find: a

    v² = v₀² + 2aΔx

    (11 m/s) ² = (20 m/s) ² + 2a (50 m)

    a = - 2.79 m/s²

    Round as needed.
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