The value of acceleration due to gravity at Earth's surface is $9.8\, m\,s^{-2}$. The altitude above its surface at which the acceleration due to gravity decreases to $4.9\, m\,s^{-2}$,is close to: (Radius of Earth $= 6.4 \times 10^6\, m$)
- A$6.4 \times 10^6\, m$
- B$9.0 \times 10^6\, m$
- C$2.6 \times 10^6\, m$
- D$1.6 \times 10^6\, m$
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