A weight lifter bench‑presses a 150.0 kg 150.0 kg barbell from his chest to a height equal the length of his arms, 0.850 m . 0.850 m. How mu

Question

A weight lifter bench‑presses a 150.0 kg 150.0 kg barbell from his chest to a height equal the length of his arms, 0.850 m . 0.850 m. How much work does he do?

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Tài Đức 4 years 2021-08-28T06:36:25+00:00 1 Answers 10 views 0

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  1. huyenthanh
    0
    2021-08-28T06:38:18+00:00
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    Answer:

    1249.5 J

    Explanation:

    Given,

    Mass of the barbell = 150 Kg

    height of the lift = 0.850 m

    Work done = ?

    Work done = F .s

    Force = m g

            =  150 x 9.8 = 1470 N

    W = 1470 x 0.850

    W = 1249.5 J

    Hence, the work done to lift the barbell is equal to 1249.5 J

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