A spaceship is $98m$ long. How fast would it have to be moving to appear only $49m$ long?

$5.6\times 10^8\mathrm{~ms}^{-1}$

$4.6\times 10^8\mathrm{~ms}^{-1}$

$2.6\times 10^8\mathrm{~ms}^{-1}$

$3.6\times 10^8\mathrm{~ms}^{-1}$