$\begin{array}{1 1}(a)\;1 &(b)\;3 \\( c)\; 2 &(d)\;6 \end{array}$

Oscillations

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Oscillations

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There are 3 unknowns generally in the equation describing SHM.

They are amplitude, frequency & phase constant .

Thus if amplitude , frequency & phase constant.

Thus if three observations displacement are made at three time instants then three simultaneous equations can be set & they can be solved to describe the motion completely.

Note some times the initial displacement & Initial velocity can both can be zero which will result in 4 unknowns.

3 is the right answer.

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