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## Homework Statement

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?

## Homework Equations

I think the equation that is relevant is L=L(sub0)xsqrt(1-v^2/c^2)

## 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.