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Math Help - the last equilibrium gravity question I need help with

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    the last equilibrium gravity question I need help with

    Two masses of 1kg each are connected by a light, inextensible string of one metre in length. The two masses are now made to approach a Black Hole of mass 7.451030 kg such that the string connecting them lies along a radius. What is the tension in the string when the nearest mass is a distance of 625 km from the Black hole?
    [G=6.67310-11 m3kg-1s-2]

    [Specify units of 'N', 'kN' or 'MN' (without quotes) in your answer.]
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