The displacement-time graph of a particle executing $SHM$ is shown. Which of the following statements is/are true ?
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$v=0$ at $t=T / 2$
a is maximum at extremes
$F=0$ at $t=\frac{3 T}{4}$
$\mathrm{K.E.}=0$ at $\mathrm{t}=\mathrm{T} / 2$
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