Physics - Gravitation Question with Solution | TestHub

The value of acceleration due to gravity at Earth's surface is$9.8 \mathrm{m}\mathrm{ }{\mathrm{s}}^{-2}$. The altitude above its surface at which the acceleration due to gravity decreases to$4.9\mathrm{ }\mathrm{m}\mathrm{ }{\mathrm{s}}^{-2}$, is close to: (Radius of earth$=6.4\times {10}^6\mathrm{ }\mathrm{m}$)