1. The problem statement, all variables and given/known data A spaceship passes you at a speed of .750c. You measure its length to be 28.2 m. How long would it be when at rest? 2. Relevant equations I think the equation that is relevant is L=L(sub0)xsqrt(1-v^2/c^2) 3. The attempt at a solution L=28.2xsqrt(1-(.75^2))=18.65m Apparently, the answer is 42.6 m. I can't even imagine how to get 42.6 from that.