a) Outline the essential problem with light, aether and the principle of relativity. ------------------------------------------------------------------------------------ ONLY PART (i) and (iii) for (b) b) 'A frame of reference' is the object against which velocity is measured. The object such as the Earth or Sun provides a coordinate system for the purpose of assigning positions and times to events (i) Contrast an inertial frame of reference with a non-inertial frame of reference (ii) Describe what you would observe if you were to drop a coin in an aeroplane which is flying horizontally at a constant speed (iii) Explain how the observation made in (ii) illustrates that the aeroplane is an inertial frame of reference

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