A ball is thrown vertically downward with an initial speed of 12.0 m/s from a height of 10.0 m above the ground. Ignoring air resista

Question

A ball is thrown vertically downward with an initial speed of 12.0 m/s from a height of 10.0 m above the ground. Ignoring air resistance, what is the speed of the ball when it reaches the ground?
(A) 18.5 m/s
(B) 14.6 m/s
(C) 14.0 m/s
(D) 12.8 m/s
(E) 12.0 m/s
Can you just take a picture of your work clearly because I have to show work. Thanks.

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Thu Giang 1 year 2021-08-31T21:26:48+00:00 1 Answers 6 views 0

Answers ( )

    0
    2021-08-31T21:28:04+00:00

    Answer:

    18.5 m/s

    Explanation:

    Take down to be positive.

    Given:

    Δy = 10.0 m

    v₀ = 12.0 m/s

    a = 9.8 m/s²

    Find: v

    v² = v₀² + 2aΔy

    v² = (12.0 m/s)² + 2 (10 m/s²) (10.0 m)

    v = 18.5 m/s

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