Question

An aeroplane revolve in a circle above the suface of eart

Answer 1

Explanation:

when the aeroplane revolving around the earth, velocity vector changes 180º when it completes half circle.

Hence if initial velocity is v, after completing half circle, velocty becomes -v. Hence change in velocity v - (-v) = 2v.

In the given question v = 100 km/hr. hence change in velocity is 200 km/hr