No, the speed at which an object moves does not determine its color when observed. The color of an object is determined by the wavelengths of light it reflects, absorbs, or emits.
When light interacts with an object, certain wavelengths are absorbed by the object, and others are reflected or transmitted. The wavelengths of light that are reflected or transmitted by the object are what determine its color. For example, an object appears red because it reflects or emits predominantly red light while absorbing other wavelengths.
The speed of an object does not directly affect the wavelengths of light it reflects or absorbs. However, there is a phenomenon called "Doppler effect" that affects the perceived frequency or wavelength of light when an object is moving relative to an observer. The Doppler effect causes a shift in the observed frequency or wavelength of light if the source of light or the observer is moving.
For example, when an object is moving towards an observer, the observed wavelength of the light it emits or reflects appears shorter, which corresponds to a shift towards the blue end of the spectrum (known as "blue shift"). Conversely, if the object is moving away from the observer, the observed wavelength appears longer, corresponding to a shift towards the red end of the spectrum (known as "red shift"). However, this is a change in observed frequency or wavelength, not a change in the inherent color of the object.
In summary, the color of an object is determined by the wavelengths of light it reflects or emits, while the Doppler effect affects the observed frequency or wavelength of light due to relative motion between the object and the observer.