Answer
$a=4$ m
Work Step by Step
We need to substitute $t=0$ in the equation and solve for $a$:
$a=4|\sec 2\pi t|$
$a=4|\sec 2\pi (0)|$
$a=4|\sec 0|$
$a=4|\frac{1}{\cos 0}|$
$a=4|1|$
$a=4$ m
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