$24.$An object when orbiting the Earth at a height of three Earth radii from the center of the Earth has a weight of $2\mathrm{.}0$N$.$ What is the object's mass? $($g at the surface of the Earth is $9\mathrm{.}80$ m$/$s$2)$

$$

a$.$

$0\mathrm{.}22$ kg

$$

b$.$

$18$ kg

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c$.$

$1\mathrm{.}8$ kg

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d$.$

$0\mathrm{.}46$ kg