First slide
Vectors
Question

R is the resultant of two vectors P¯ and Q¯ . If R makes an angle of 900 with P¯ and 300 with Q¯ , then the ratio P¯ : Q¯ is 

Easy
Solution

Vectors are added by parallelogram law. Note that the angle between the vectors P¯ and Q¯  is 1200.

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