A body weight $\mathrm{W}$, is projected vertically upwards from earth's surface to reach a height above the earth which is equal to nine times the radius of earth. The weight of the body at that height will be :
$\frac{W}{91}$
$\frac{\mathrm{W}}{3}$
$\frac{\mathrm{W}}{100}$
$\frac{\mathrm{W}}{9}$
Solution
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