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Assertion (A): Work done by a force is zero when the force acts perpendicular to the displacement. Reason (R): Work is calculated as the product of force and displacement in the direction of the force.
A force F = (5î + 3ĵ) newton is applied over a particle which displaces it from its origin to the point r = (2î − 1ĵ) metres. The work done on the particle is
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