I've seen this question asked many times and similarly the responders go on about the relativity of units of measure. That's doesn't answer the question, but in reality, no one really knows. The speed of light is a constant of nature, just like the value for the Planck constant. The best answer...
I don't know the math that well, but I do know running and the vid attributes Bolt's top end speed in the constant speed phase of the run, from 40 through 100 meters, as the result of an equilibrium between the ground reaction force moving him forward and wind resistance as a force to the rear...
If I have a mass of 80 kg, what would the difference in my weight be at either the North or South Pole and at the equator? It would seem to me that the spin of the Earth would induce a centrifugal effect that would counter somewhat Earth's gravitational pull at the equator, but not do so at...