The resultant of two forces \( 3 p \) and \( 2 p \) is \( R \). If the P first force is doubled ...

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The resultant of two forces \( 3 p \) and \( 2 p \) is \( R \). If the
P first force is doubled keeping same direction, then
\( \mathrm{W} \) the resultant is also doubled. Find the angle between two forces.
(1) \( 60^{\circ} \)
(2) \( 120^{\circ} \)
(3) \( 150^{\circ} \)
(4) \( 90^{\circ} \)
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