Earth's mass is 5.98 x 10²⁴ kg. Calculate the value of g at a point 4.8 x 10⁵ km from the centre of earth.
a. 9.8 x 10⁻² N/kg
b. 8.3 x 10⁵ N/kg
c. 1.7 10⁻³ N/kg
d. 1.7 x 10³ N/kg
e. 9.8 x 10⁻⁵ N/kg