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Q.

Read the following statement and give the correct answer 

Work is said to be done when: 

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a

(i) a force should act on an object, and (ii) the object must be displaced.

b

(i) no force should act on an object, and (ii) the object must be displaced.

c

(i) a force should act on an object, and (ii) the object must not be displaced.

d

(i) no force should act on an object, and (ii) the object must not be displaced.

answer is A.

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Detailed Solution

Work is said to be done when: 
(i) a force should act on an object, and (ii) the object must be displaced.
Work done on an object is defined as the product of the magnitude of the force acting on the body and the displacement in the direction of the force. W = F.s. The SI unit is a Joule

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