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Finding escape velocity and radius of event horizon in general

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How do you find both the escape velocity and radius of the event horizon using general relativity? The equation used for both escape velocity and the Schwarzschild radius

v=sqrt(2GM/r) and r=2GM/c^2

does not work.

Pic relate
>>
>>8955351
you can use r = 2GM/c^2
>>
>>8955754

That equation is a product of Newtonian mechanics. It isn't applicable to relativity.
>>
>>8955769
give this a go

v^2 = c^2 * (Rs/R)
I always used the Newtonian one when I was at uni. (Rs is swartzchild radius) You can derive it from the relativistic energy formula as well as the one for radius
>>
>>8956416
I'd also like it point out it is applicable as it was calculated in relevance to Einsteins Field Equations
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