Two putty balls of equal mass moving with equal velocity in mutually perpendicular directions, stick together after collision. If the balls were initially moving with a velocity of $45\sqrt 2 \,m{s^{ - 1}}$ each, the velocity of their combined mass after collision is .................. $\mathrm{m} / \mathrm{s}^{-1}$

  • A

    $45\sqrt 2$

  • B

    $45$

  • C

    $90$

  • D

    $22.5\sqrt 2$

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