Physics

Problem

The value of acceleration due to gravity at Earth's surface is

9.8 \text{ ms}^{-2}

. The altitude above its surface at which the acceleration due to gravity decreases to

4.9 \text{ ms}^{-2}

, is close to : (Radius of earth =

6.4 \times 10^6 \text{ m}

) a.

2.6 \times 10^6 \text{ m}

6.4 \times 10^6 \text{ m}

9.0 \times 10^6 \text{ m}

1.6 \times 10^6 \text{ m}