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The resultant of two forces F(1) and F(2...

The resultant of two forces `F_(1) and F_(2)` is P. If `F_(2)` is reversed , then resultant is Q . Then the value of `(P^(2)+Q^(2))` in terms of `F_(1) and F_(2)` is

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The correct Answer is:
`2(F_(1)^(2)+F_(2)^(2))`
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