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. Concept of Physics - 1 , HC VERMA , Chapter "Rest and Motion : Kinematics
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Answer is b : 70 km/h towards south-west
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Initial velcoity =Vn=50km/hr due north
Final velocity =Vw=50 km/hr due west.
Change in velocity =Vw-Vn=Vw+(-vn)
Final resultant velocity=√ [502 +502]=70km/h
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*************************************************
Initial velcoity =Vn=50km/hr due north
Final velocity =Vw=50 km/hr due west.
Change in velocity =Vw-Vn=Vw+(-vn)
Final resultant velocity=√ [502 +502]=70km/h
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