Question: Plotting functions containing units

Dear Maple users

Often I use Maple for solving problems in Physics. Maple does indeed a nice job when calculating expressions containing units. However when I want to plot functions containing units it sometimes work and sometimes not. Look at the following example: 

 

The first plot works (I omittet Maple's answer with a colon because of limited place here), but the slight change as shown in the second plot makes it fail!

Can someone tell me the logic behind Maple's behavior here and eventually explain to me how I make the second plot work?

Regards,

Erik 

 

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