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13. A bus is moving on a straight road t...

13. 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 (a) 70.7 km/hour along south-west direction (b) 70.7 km/hour along north-west direction. (c) 50 km/hour along west (d) zero

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