Question

what will be the value of acceleration due to gravity at a height of the radius of the earth , from the surface of the earth what will be the value of acceleration due to gravity at a height of the radius of the earth , from the surface of the earth

Answer 1

The acceleration due to gravity can be found by Newton's law of universal gravitation:

$$mg=G\frac{Mm}{R^2}=9.8\text{ m/s}^2.$$