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The resultant of forces vecP and vecQ is...

The resultant of forces `vecP and vecQ is vecR.` If `vecQ` is doubles then `vecR` is doubled. If the direction of `vecQ` is reversed then `vecR` is again doubled . Then `P^2:Q^2:R^2` is (A) `3:1:1` (B) `2:3:2` (C) `1:2:3` (D) `2:3:1`

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