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17 December, 14:05

Ben Pumpiniron applies an upward force to lift a 129-kg barbell to a height of 1.98 m at a constant speed. How much work has Been done?

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Answers (2)
  1. 17 December, 14:09
    0
    Work done is 2505.67 J

    Step-by-step explanation:

    Work done = Force x Displacement

    Force = Weight of pumpkin

    Weight of pumpkin = Mass of pumpkin x Acceleration due to gravity

    Weight of pumpkin = 129 x 9.81 = 1265.49 N

    Height to which pumpkin is displaced = 1.98 m

    Displacement = 1.98 m

    Work done = Force x Displacement

    Work done = 1265.49 x 1.98

    Work done = 2505.67 J

    Work done is 2505.67 J
  2. 17 December, 14:29
    0
    The work has Been done is 2503.12 J.

    Step-by-step explanation:

    Formula for workdone is given by

    Workdone = Force * Distance

    As w = mg

    Where m is the mass, g is the acceleration of gravity.

    As given

    Ben Pumpiniron applies an upward force to lift a 129-kg barbell to a height of 1.98 m at a constant speed.

    m = 129 kg

    g = 9.8 m / s²

    Putting in the w = mg

    w = 129 * 9.8

    = 1264.2 kg m / s²

    (As given in the question force is constant thus force doing the work is equal to weight.)

    Thus

    Force = 1264.2 kg m / s²

    Workdone = Force * Distance

    = 1264.2 * 1.98

    = 2503.12 J (Approx)

    Therefore the work has Been done is 2503.12 J.
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