Answer
$t=4.4s$
Work Step by Step
The time period is given as:
$T=\frac{2\pi}{\omega}$
$T=\frac{2\times 3.1416}{10}=0.628s$
It is given that there are 7 cycles. Therefore;
$t=7T=7(0.628)=4.4s$
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