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27 November, 01:04

At a given instant in time, a 18-kg rock is observed to be falling with an acceleration of 7.75 m/s2. What is the magnitude and direction of the gravitational force on the rock?

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  1. 27 November, 01:52
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    36.9 N

    Explanation:

    m = 18 kg

    a = 7.75 m/s^2

    g = 9.8 m/s^2

    F = mg - ma = 18 (9.8 - 7.75)

    F = 18 x 2.05 = 36.9 N

    The gravitational force acting on the rock is 36.9 N.
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