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  4. A force (3 hati+2 hatj)N displaces an object through a distance (2 hati+3 hatj)M The work done is:

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Q. A force $ (3\hat{i}+2\hat{j})N $ displaces an object through a distance $ (2\hat{i}+3\hat{j})M $ The work done is:

Haryana PMTHaryana PMT 2000

Solution:

Using the relation, $ W=F.s$
$=(3\hat{i}+2\hat{j}):(2\hat{i}-3\hat{j}) $
$ =3\times 2+2\times -3 $
$ =6-6=0 $