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Question
Why is the work done by a body zero, when a force acts at right angles to the direction of displacement?
Short Answer
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Solution
Work done is given by W = FS cos θ, where θ is the angle between force and displacement. When the force acts at right angles to the displacement, θ = 90° and cos 90° = 0. Therefore, W = FS × 0 = 0.
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