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A point mass is subjected to two simulta...

A point mass is subjected to two simultaneous sinusoidal displacement in x direction, `x_(1)(t)=Asinomegat andx_(2)(t)=Asin(omegat+(2pi)/3)`. Adding a third sinusoidal displacement `x_(3)(t)=Bsin(omegat+phi)` brings the mass to a complete rest. Find the values of B and `phi`.

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The correct Answer is:
`A,(4pi)/3`
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