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Physics help

Hi Kelly,

Rex letter made me look back at out letters from last week.

When I use the following numbers:

Vexh=0.0667c (2E7 m/s)
dV  =0.3c    (9E7 m/s)

and the classic rocket formula:


I get:


and not the 148 (or 150) you seemed to get.

Is this the reason for the confusion that had arised?