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21 July, 03:28

A ball is thrown 178 m upward and then falls back to earth. Neglecting air resistance, how long will it be in the air? The acceleration of gravity is 9.8 m/s 2.

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  1. 21 July, 06:34
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    Answer: 12.06secs

    Step-by-step explanation:

    T = 2t

    t = sqrt (2H/g)

    H = 178 m

    g = 9.8m/s2

    t = sqrt (2H/g) = t = sqrt (2x178/9.8)

    t = 6.03sec

    T = 2t = 2 x 6.03 = 12.06secs
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