Answer
$5.52\frac{N}{m}$
Work Step by Step
We know that
$K=(2\pi f)^2m$
We plug in the known values to obtain:
$K=(2\pi \times (14.5\times 10^6))^2(6.65\times 10^{-16})$
$K=5.52\frac{N}{m}$
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