A spaceship of speed $v_0$ travelling along $+ y$ axis suddenly shots out one fourth of its part with speed $2v_0$ along $+ x$ -axis. $xy$ axes are fixed with respect to ground. The velocity of the remaining part is

  • A

    $\frac{2}{3}{v_0}$

  • B

    $\frac{{\sqrt {20} }}{3}{v_0}$

  • C

    $\frac{{\sqrt 5 }}{3}{v_0}$

  • D

    $\frac{{\sqrt {13} }}{3}{v_0}$

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