Three simple harmonic motions of equal amplitudes $A$ and equal time periods in the same direction combine. The phase of the second motion is $60^o$ ahead of the first and the phase of the third motion is $60^o$ ahead of the second. Find the amplitude of the resultant motion
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Resultant of $1 \& 3$ is also $\mathrm{A}$ in the direction of $2.$
$\Delta \phi=120^{\circ}$ between $1 \& 3$
$A_{\text {net }}=A+A=2 A$
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