A bus is moving on a straight road towar...

A bus is moving on a straight road towards north with a uniform speed of 50 `km//hour` turns through `90^(@)`. If the speed remains unchanged after turning, the increase in the velocity of bus in the turning process is

`70.7 km//h` along south-west direction

zero

`50 km//h` along west

`70.7 km//h` along north-west direction.

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