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What will be the acceleration due to gravity at 300 kms above MSL, assuming the gravity at MSL is 9.81 m/s2 and the radius of Earth is 6378 km?

Correct Answer: 95.5% of gravity at MSL
Given, Gravity at MSL (g0) = 9.81 m/s2 Geopotential altitude (h) = 300 km Radius of earth (RE) = 6378 km Gravity at 300 km above MSL (g) = g0.(RE/(RE + h))2 = 9.81*(6378/(6378+300))2 = 9.718 m/s2 Percentage = (9.718/9.81) x 100% = 95.5% of MSL gravity

Arun and Amit started walking from two different points 'A' and 'B' respectively.Arun walks 2 kms North and turns to the East and walks 3 kms and again turns to North walks 4 kms and finally turns to East and Walks 5kms to reach point 'C'. Similarly, Amit walks 2 kms North and turns to west and walks 3 kms and finally turns to North, walks 4 kms and meets Arun at point 'C'. What is the distance between Arun and Amit's starting points?

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