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26 December, 19:16

A 1 kg particle moves upward from the origin to (23) m. Wit is work done by the force of gravity which is in - y direction s B. 19,6 D. 29.4) A.-19.6 J C. - 29.4 J

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  1. 26 December, 20:21
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    mass, m = 1 kg

    Position (2, 3) m

    height, h = 2 m

    acceleration due to gravity, g = 9.8 m/s^2

    Here, no force is acting in horizontal direction, the force of gravity is acting in vertical direction, so the work done by the gravitational force is to be calculated.

    Force mass x acceleration due to gravity

    F = 1 x 9.8 = 9.8 N

    Work = force x displacement x CosФ

    Where, Ф be the angle between force vector and the displacement vector.

    Here the value of Ф is 180° as the force acting vertically downward and the displacement is upward

    So, W = 9.8 x 2 x Cos 180°

    W = - 19.6 J

    Thus, option (A) is correct.
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