Answer
$v=66.1\frac{m}{s}$
Work Step by Step
We know that,
$v=\sqrt\frac{T}{\mu}$
We plug in the known values to obtain:
$v=\sqrt\frac{7N}{\frac{2\times 10^{-3}kg}{1.25m}}=66.1\frac{m}{s}$
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