Relativistic Escape from a Schwarzschild Black Hole Orbit

A spacecraft of rest mass is moving in a stable circular orbit around a non-rotating (Schwarzschild) black hole of mass .

The orbit radius is r=4r?,and rs=2GmC

= gravitational constant,

= speed of light.

Assume:

The spacecraft engines can provide an instantaneous tangential burn.

Relativistic mechanics must be used (Newtonian formulas are not valid).

The black hole is isolated (no accretion disk, no rotation).

Requirements:

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