# maths

The weight of an object varies inversely as the square of its distance from the centre of the earth. The weight of an aeroplane is observed to be only 4/9 of its weight on earth. How far is the aeroplane from the surface of the earth. Take the radius of the earth to be 6400km

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1. aeroplane ... or space capsule?

inverse square root of 3/2

(3/2 * 6400) - 6400

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2. woof ... not fully awake yet

inverse square root of 4/9 is 3/2

(3/2 * 6400) - 6400 = ?

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