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Three simple harmonic motions in the sam...

Three simple harmonic motions in the same direction having same amplitude and the same period are superposed. If each differs in phase from the next by `lambda//2` then which of the following is wron.
(`i`) Resultant amplitude is `(sqrt(2)+1)` a
(`ii`) Phase of resultant motion relative to first is `90^(@)`
(`iii`) The energy associated with the resulting motion is `3` times the energy associated with any single motion

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