Question: problem with constants (without E0)  (with E0)

It's a links to my worksheets (used maple 11). And now the problems:

1)can't put E0=0,1(didn't try others but I need 0,1) or vmax. If I put only vmax I get vmax=10*Eand if I put both I get vmax=0,10 What I do wrong?? if I put E0 maple starts to suck and doesn't count equations properly

3) how to plot S=S0(1-v0/S0) graph t=0 .. 3.

Thank you for help

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