The value of acceleration due to gravity at Earth’s surface is 9.8ms^−2 . The altitude above its surface at which the acceleration due to gravity decreases to 4.9ms ^−2 , is close to :(Radius of earth =6.4×10^6 m) is close to :(Radius of earth =6.4×10^6 m) The value of acceleration due to gravity at Earth's [...]