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BALLISTIC TRAJECTORIES

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THE ESCAPE VELOCITY<br />

• A vehicle will escape earth if it has a parabolic<br />

(e=1) or hyperbolic (e>1) trajectory<br />

• In the case of a parabolic trajectory, the kinetic<br />

and potential energies are equal<br />

• The escape velocity is larger than orbital<br />

velocity by a factor of 2 1/2<br />

• If at burnout V b Km/sec the vehicle will<br />

escape earth independent of the direction of<br />

motion

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