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1 November, 06:14

You do 200 joules of work against gravity when lifting your backpack up a flight of stairs that is 4 meters tall. What is the weight of your backpack in newtons?

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  1. 1 November, 09:14
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    Correct answer: F = 50 N weight of backpack

    Explanation:

    Given:

    W = 200 J work against gravity

    h = 4 m

    F = m g = ?

    g = 10 m/s²

    The work done is a measure of change in this case of potential energy

    W = Δ Ep = m g h = F · h ⇒ F = W / h =

    F = W / h = 200 / 4 = 50 N

    F = 50 N

    God is with you!
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