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Physics
Classical Physics
Mechanics
Unusual escape velocity derivation
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[QUOTE="jbriggs444, post: 6239394, member: 422467"] One could, of course, attack the problem from first principles using forces and masses, determining a trajectory and evaluating the required initial velocity to reach a chosen distance using a particular launch angle. One could then take the limit as the target distance is allowed to increase without bound. Similarly, one could exploit time reversal symmetry and use the same approach to determine the final velocity and impact angle for a drop from a large finite distance with a particular initial angular momentum and then take the limit as the initial distance is allowed to increase without bound. But it is so much easier to use the fact the the gravitational field is conservative. It then follows immediately that the trajectory is irrelevant and that only the starting and ending points matter. [/QUOTE]
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Forums
Physics
Classical Physics
Mechanics
Unusual escape velocity derivation
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