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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
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B
150 km/hr
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C
1002 km/hr
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D
0
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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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