Kinematics Question 25

Question: 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 [RPET 1998; KCET 2000]

Options:

A) 200 km/hr

B) 150 km/hr

C) $ 100\sqrt{2}km/hr $

D) 0

Show Answer

Answer:

Correct Answer: A

Solution:

$ \Delta v=2v\sin ( \frac{\theta }{2} )=2\times v\times \sin 90{}^\circ $

$ =2\times 100=200\ km/hr $



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