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10 December, 06:02

If a ball rolls off a 4m high table at 7m/s, how long will it take until it hits the floor

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  1. 10 December, 06:22
    0
    0.9 s

    Explanation:

    Given (vertical direction):

    y₀ = 4 m

    y = 0 m

    v₀ = 0 m/s

    a = - 9.8 m/s²

    Find: t

    y = y₀ + v₀ t + ½ at²

    (0 m) = (4 m) + (0 m/s) t + ½ (-9.8 m/s²) t²

    t ≈ 0.9 s
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