1.

The vector40î + 30ĵ is added to a vector. The result gives 15î + 3ĵ as the answer. The unknown vector is _____(a) -25î – 27ĵ(b) 25î + 27ĵ(c) -25î + 27ĵ(d) 25î – 27ĵThe question was asked by my college director while I was bunking the class.My enquiry is from Vector Addition topic in chapter Motion in a Plane of Physics – Class 11

Answer»

Correct CHOICE is (a) -25î – 27ĵ

The best I can explain: The REQUIRED vector can be OBTAINED by subtracting 40î + 30ĵ from 15î + 3ĵ. The RESULT gives -25î – 27ĵ. One should pay attention on which vector has to be subtracted from which one.



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