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The displacement of a particle under the action of several forces is △ r = 4i-5j + 6K, and one of the forces is f = - 3i-4j + 5K. The work done by this force in the displacement is calculated
W=F*△r=(-3i-4j+5k)*(4i-5j+6k)=-12i+20j+30k=√(12^2+20^2+30^2)=38J
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