I'm attempting a question that reads: A moving meter stick is measured to be 80 cm. What is its speed? The related formula is L = Lo/gamma where gamma = 1 / (1 - (v/c)^2)^(1/2) I looked at the solution provided and the first statement is: Lo = 100cm. I understand the rest from there but I have no idea where this 100cm comes from. Can anyone explain?