Find the velocity relative to an inertial frame (in which the centre of the Earth is at rest) of a point on the Earth's equator. An aircraft is flying above the equator at 1000 km h-1. Assuming that it flies straight and level (i.e., at a constant altitude above the surface) what is its velocity relative to the inertial frame a) if it flies north b) if it flies west c) if it flies east
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