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   Compute specific impulse from exhaust velocity
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   Form:
   v = Isp2V( iSP, g )
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   ------
   Inputs
   ------
   iSP         (1,:)  Specific impulse (sec)
   g           (1,1)  Acceleration of gravity (9.8055 m/sec^2)

   -------
   Outputs
   -------
   v            (1,:)  Exhaust velocity 

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