Question

# A plane is revolving around the earth with a speed if $$100\ km/hr$$ at a constant height from the surface of earth. The change in the velocity as it travels half circle is

A
200 km/hr
B
150 km/hr
C
1002 km/hr
D
0

Solution

## The correct option is C $$200\ km/hr$$As we know,$$\Delta v=2v\sin \left( \dfrac{\theta}{2}\right)=2\times v\times \sin 90^o$$$$=2\times 100=200\ km/hr$$Physics

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