7 A steel sphere is released from a height of 9 m on the surface of the Moon. It is known that the acceleration due to gravity

Question

7 A steel sphere is released from a height
of 9 m on the surface of the Moon. It is
known that the acceleration due to gravity
on the Moon is 1 the acceleration due
6
to gravity on the surface of the Earth.
Calculate the time taken by the sphere to
hit the surface of the Moon.
A 1.8 S
C 3.3 s
B 2.6 s
D 4.2 s​

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Yến Oanh 5 years 2021-08-03T17:59:27+00:00 1 Answers 16 views 0

Answers ( )

  1. Doris
    0
    2021-08-03T18:00:39+00:00
    Reply

    Answer:

    C 3.3 s

    Explanation:

    Given:

    Δy = 9 m

    v₀ = 0 m/s

    a = ⅙ (9.8 m/s²) = 1.63 m/s²

    Find: t

    Δy = v₀ t + ½ at²

    9 m = (0 m/s) t + ½ (1.63 m/s²) t²

    t = 3.3 s

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