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a)Distinguish between positive and negative work.b)When you lift an object, two forces act on itidentify these forces. Which one of two is :) Positive workJustify your answer.ii) Negative work.[CBSE-2012)]

Answer»

a

b.when we lift an object 2 forces acts on it these are: (I) muscular force and (II) gravitational force a. positive work is done by the muscular force because thedisplacement is in the direction of the muscular force .b. negative work is down by the gravitational force because displacement is in the opposite direction to which the gravitational force is acting ...



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