Quote:
Originally Posted by DonRotolo
Well, wouldn't you be able to reach c, but not exceed it?
That means you CAN reach c. Going past c is what requires infinite energy, reaching c needs just a smidgen less than infinity.
And yes, we're assuming the object rest mass is nonzero
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As v -> c, y -> inf, so we cannot even get to c because the "infinite energy" is when you reach c.
At v=c, B=v/c=1, so y=1/sqrt(1-B^2) is already undefined (or infinity, if that's how you want to define dividing by zero).