1. 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
(a) 50 km/h towards west
(b) 70 km/h towards south-west
(c) 70 km/h towards north-west
(d) zero.
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Answer:
(b) 70 km/h towards south-west
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