A soccer ball is kicked straight upwards with an initial vertical speed of 8.0\,\dfrac{\text m}{\text s}8.0 s m ​ 8, point, 0, start fractio

Question

A soccer ball is kicked straight upwards with an initial vertical speed of 8.0\,\dfrac{\text m}{\text s}8.0 s m ​ 8, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction. We can ignore air resistance. How long does it take the ball to have a downwards speed of 4.0\,\dfrac{\text m}{\text s}4.0 s m ​ 4, point, 0, start fraction, start text, m, end text, divided by, start text, s, end text, end fraction?

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Sapo 1 year 2021-08-14T04:57:46+00:00 1 Answers 152 views 0

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    2021-08-14T04:59:19+00:00

    Answer:

    1.2 s

    Explanation:

    Given:

    v₀ = 8.0 m/s

    v = -4.0 m/s

    a = -10 m/s²

    Find: t

    v = at + v₀

    (-4.0 m/s) = (-10 m/s²) t + (8.0 m/s)

    t = 1.2 s

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