3. A Japanese bullet train slows from a speed of 50 m/sec to a speed of 40 m/sec in 500m. What is its acceleration?

Question

3. A Japanese bullet train slows from a speed of 50 m/sec to a speed of 40 m/sec in 500m.
What is its acceleration?

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Thanh Hà 4 years 2021-07-13T15:20:00+00:00 1 Answers 4 views 0

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  1. thuhuong
    0
    2021-07-13T15:21:48+00:00
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    Answer:

    -0.9 m/s²

    Explanation:

    Given:

    Δx = 500 m

    v₀ = 50 m/s

    v = 40 m/s

    Find: a

    v² = v₀² + 2aΔx

    (40 m/s)² = (50 m/s)² + 2a (500 m)

    a = -0.9 m/s²

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Giải phương trình 1 ẩn: x + 2 - 2(x + 1) = -x . Hỏi x = ? ( )