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Q.

A motor car is going due north at a speed of 50 km/h. It makes a 90° left turn without changing the speed. The change in the velocity of the car is about 

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a

zero

b

70 km/h towards south - west

c

70 km/h towards north - west

d

50 km/h towards west

answer is B.

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Detailed Solution

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Δv=vf-vi=-50i^-50j^ km/h

Δv=502=70.7 km/h

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