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Q)

The resultant of two forces $P \;N$ and $3\; N$ is a force of $7\; N$. If the direction of the $3\; N$ force were reversed, the resultant would be $\sqrt{19} N$. The value of $P$ is :


( A ) 4 N
( B ) 3 N
( C ) 5 N
( D ) 6 N

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