The resultant of two vectors P and Q is R. If Q is doubled, thenew resultant is perpendicular to P.

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The resultant of two vectors P and Q is R. If Q is doubled, the
new resultant is perpendicular to P. Then R equals
(a) P (b) (P+Q) (c) Q (d) (P–Q)
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Thank you so much sir. I really appreciate your way of teaching.

divyanirai
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How is this correct? Isnt r only perpendicular when q is doubled

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