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
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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- [AIIMS 2009]
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