Mass of Earth when it's radius is 6400 km and gravitational field
strength is 9.81 N kg-1 is
A. 6.0 × 1024 kg
B. 5 × 1023 kg
C. 40 × 109 kg
D. 9 × 1024 kg
strength is 9.81 N kg-1 is
A. 6.0 × 1024 kg
B. 5 × 1023 kg
C. 40 × 109 kg
D. 9 × 1024 kg