A space-ship is $98\ m$ long. How fast would it have to be moving to appear only $49\ m$?

$2.25\times 10^8\mathrm{~ms}^{-1}$

$2.75\times 10^8\mathrm{~ms}^{-1}$

$2.60\times 10^8\mathrm{~ms}^{-1}$

$1.85\times 10^8\mathrm{~ms}^{-1}$