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# A steel ball is bouncing up and down on a steel plate with a period of oscillation of 1 second. If $g= 10\;ms^{-2}$, then if bounces up to a height of

$\begin{array}{1 1} 5\;m \\ 10\;m \\ 2.5\;m \\ 1.25\;m \end{array}$