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Two forces act on a body. One of them is 7î – 13ĵ. What is the value of the other force?

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Two forces act on a body. One of them is 7î – 13ĵ. What is the value of the other force?

(a) 7î – 13ĵ

(b) -7î + 13ĵ

(c) 7î + 13ĵ

(d) -7î – 13ĵ

This question was posed to me in an online interview.

The above asked question is from Laws of Motion in portion Laws of Motion of Physics – Class 11

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Right option is (a) 7î – 13ĵ

The best I can explain: For the body to remain in equilibrium, the total force on it should be zero. As one of the forces is given, the other force can be found out by subtracting it from zero. Hence the answer is -7î + 13ĵ.

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