Answer
$63.6$ m
Work Step by Step
We need to substitute $t=0$ in the equation and solve for $a$:
$a=4|\sec 2\pi t|$
$a=4|\sec 2\pi (1.24)|$
$a=4|\sec 7.791|$
$a=4|\frac{1}{\cos 7.791}|$
$a=4|15.89|$
$a=63.56\approx63.6$ m
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