Kinematics Question 25
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\ km/hr =200\ km/hr $
BETA
