A bus is moving on a straight road towards north with a uniform speed of $50\; km / hour$ then it turns left through $90^{\circ} .$ If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is

  • [AIPMT 1989]
  • A

    $50 \;km / hr$ along west

  • B

    $0$

  • C

    $70.7 \;km / hr$ along south-west direction

  • D

    $70.7\; km / hr$ along north-west direction

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