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10 January, 11:20

Imagine a ball fired from a height of 2.0 m at 3.0 m/s, and at 45° above horizontal. If the ball lands on horizontal ground, where does it do so?

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  1. 10 January, 14:38
    0
    1.89 m

    Explanation:

    h = 2 m

    u = 3 m/s

    θ = 45

    Let t be the time taken

    use second equation of motion in vertical direction

    h = u t + 1/2 a t^2

    - 2 = 3 Sin 45 t - 1/2 x 9.8 x t^2

    - 2 = 2.12 t - 4.9 t^2

    4.9 t^2 - 2.12 t - 2 = 0

    By solving we get

    t = 0.89 sec

    Let x be the horizontal distance travelled

    x = u Cos 45 x t

    x = 3 Cos 45 x 0.89 = 1.89 m
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