Question

what is the work done by constant force?when is it positive,negative or zero?​

Answer 1

Answer:

For a falling body, the displacement of the body is negative, Δy≡yf−yi<0; therefore the work done by gravity is positive, Wg>0. The gravitation force is pointing in the same direction as the displacement of the falling object so the work should be positive

Answer 2

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That is, for those simplifying conditions, the work done by a constant force on an object when it moves a distance ∆x in the same direction as the force is just the magnitude of the force times the displacement.

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