The colors you describe are probably the result of a Doppler effect, going from green to yellow to red as it flew past you. Had you caught it earlier, you might even have seen a little blue
You are joking about the Doppler effect, I hope, with respect to visible color.
Unless the meteor was traveling close to the speed of light.
OTOH, were it "whizzing", or making other noise, the frequencies would change according to Doppler.
No I don't think so. To get a visible shift at optical wavelengths, the speed would have to be much higher than even a meteorite or reentering satellite, tankage, etc.
Besides that's not what I described. The middle part had color, the left and right ends were just off white.