A body is dropped from a height of 30m. What is the velocity of the body after it has covered a distance of 20 m? (Given g= 10 m/s 2) p

Question

A body is dropped from a height of 30m. What is the velocity of the body after it has covered a distance of 20 m? (Given g= 10 m/s 2)
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Kim Cúc 6 months 2021-07-26T12:51:24+00:00 2 Answers 105 views 1

Answers ( )

    0
    2021-07-26T12:52:44+00:00

    Answer:

    approximately 19.8  m/s

    If using g = 10 m/s^2, the answer rounds to 20 m/s

    Explanation:

    You can use the kinematic formula that relates distance covered, velocities and acceleration (without time dependence) given by:

    v_f^2-v_i^2=2\,*\,a\,*displacement

    which in our case becomes:

    v_f^2-0=2\,*\,(9.8\,\frac{m}{s^2}) \,*(20\,m)\\v_f^2=392\\v_f\approx 19.8\,\frac{m}{s}

    If using g = 10 m/s^2, the answer is 20 m/s

    0
    2021-07-26T12:53:03+00:00

    Answer:

    the velocity is 20m/s

    Explanation:

    data given

    1. Height (h)=20m
    2. Gravity (g)=10m/s2
    3. velocity v = 0
    4. velocity u =?

    v2 = u2 - 2gh

    0 = u2 – 2 (10)(20)

    0 = u2 – 400

    400 = u2

    20m/s = u

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