A plane is revolving around earth with a speed of 100, km/hr at a constant height from surface of ea

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3-2.Motion in Plane

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

A$200$

B$150$

C$100 \sqrt 2$

D$0$

Solution

(a) $\Delta v = 2v\sin \left( {\frac{\theta }{2}} \right) $
$= 2 \times v \times \sin 90^\circ $
$ = 2 \times 100 = 200\;km/hr$

Standard 11

Physics

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