How Strong Is Gravity Of A Black Hole
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The gravity is, far from the centre, exactly the same as from a star with the same mass.
If you go closer the gravity grows stronger, as with any massive object.
In the case of a black hole you can get much closer to the centre than you can with a star of similar mass, so the gravity goes up according to the inverse square-law formula (F=GMm/r2), but when you get VERY close the the centre we do not know what happens, if r (distance to centre) is zero then the formula says the force should be infinite - this will NOT happen.
But we need a theory of Quantum Gravity to know exactly WHAT happens at that stage.
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