The radius in kilometer to which the present radius of earth (R = 6400 km)

The radius in kilometer to which the present radius of earth (R = 6400 km) to be compressed so that the escape velocity is increased 10 times is _______ {JEE-17^THmarch 2021/gravitation}

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The radius in kilometer to which the present radius of earth (R = 6400 km)

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