What the gravitational potential at a distance 7.2x107 m from the centre of the planet if The gravitational potential at a distance 2.26x107 m from the centre of a planet of radius 8.55x106 m is -5.6?

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What the gravitational potential at a distance 7.2x107 m from the centre of the planet if The gravitational potential at a distance 2.26x107 m from the centre of a planet of radius 8.55x106 m is -5.6?