Answer
$5.62Kg$
Work Step by Step
We know that
$\Sigma F_y=-Ky-mg=0$
This simplifies to:
$m=-\frac{K}{g}$
We plug in the known values to obtain:
$m=-\frac{(1750)(-0.0315)}{9.81}$
$m=5.62Kg$
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