A Physics Quiz of a different type

[Aren Siekmeier]

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

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).