Question

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An aeroplane revolves in a circle above the surface of the earth at a fixed height with speed 100 km/ h . the change in velocity after completing 1/2 revolution will be?

1) 200 km/h
2) 150 km/h
3) 300 km/h
4) 400 km/h

Answer 1

answer: 200km/h

explanation: let us consider the plane is moving east

so initial velocity is 100 i

after halfway its velocity is towards west so

100(-i)= -100 i

change in velocity = final velocity-initial velocity

change = 100-(-100)

=200