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16 November, 04:10

A ball is thrown straight down with a speed of Va2.00 from a building 40.00 meters high. How much S time passes before the ball reaches the ground? a.) - 3.07s b.) - 2.46 s c.) = 2.66s d.) = 9.89s e.) None of the above. A ball is thrown straight down with a speed of Va2.00 from a building 40.00 meters high. How much S time passes before the ball reaches the ground? a.) - 3.07s b.) - 2.46 s c.) = 2.66s d.) = 9.89s e.) None of the above.

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  1. 16 November, 04:47
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    Option C is the correct answer.

    Explanation:

    Considering vertical motion of ball:-

    Initial velocity, u = 2 m/s

    Acceleration, a = 9.81 m/s²

    Displacement, s = 40 m

    We have equation of motion s = ut + 0.5 at²

    Substituting

    s = ut + 0.5 at²

    40 = 2 x t + 0.5 x 9.81 x t²

    4.9t² + 2t - 40 = 0

    t = 2.66 s or t = - 3.06 s

    So, time is 2.66 s.

    Option C is the correct answer.
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