An aeroplane revolves in a circle above the surface of the earth at a fixed height with speed 40 km/hr. What is the magnitude of change in velocity after completing 1/2 revolution?
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Answer: -80km/hr
Explanation:
Let suppose initial velocity is 40km/hr in north
After half rotation
Velocity will be 40km/hrs south
Change in velocity =final -initial
=40(south) -40(north)
= -40(north) - 40north
=-80km/hrs
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