A 6000kg locomotive is pulling 4000kg cars to the right. The locomotive is experiencing a 1000N drag and the cars each experience a 10OON drag. How much force does the locomotive need to generate to pull the given number of cars with a constant speed? The number of cars does not include the locomotive. applied number of cars force 10 cars 20000 N 20 cars 30 cars N 40 cars N 50 cars

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Speed of light

The speed at which the light travels in a vacuum is unbiased for both the source and inertial frame of reference of the observer. This was postulated by the physicist, Albert Einstein, by observing the theory of electromagnetism of Maxwell. Also, there was no evidence for the luminiferous aether, that is, the medium for the propagation of light where the electromagnetic field exists.