Quarks have not been observed to exist separately - they are "confined" within larger particles such as protons and neutrons, that are made up of several quarks (3 each, in the case of protons and neutrons).
No, quarks have mass and nothing with mass is allowed to reach the speed of light no matter how much energy is used to accelerate it.
It depends on how much energy it has
It isn't clear at all what you mean. In any case, it isn't possible to travel at the speed of light - except for specific particles, such as photons (pieces of light), which can ONLY travel at the speed of light.
In an atom, the neutrons and protons are made up of up quarks and down quarks. Strange quarks, charms quarks, top quarks, and bottom quarks also exist, but do not play as much of a role in the structure of an atom.
Protons and neutrons contain quarks.
Actually quarks can exist freely.
Neutrons consist of small particles, called "Quarks". Protons also consist of quarks, but what quarks is made of, is still not discovered.
When the light is traveling through vacuum.
Electrons are able to travel close to speed of light.
Yes.
To an outside observer a person traveling at the speed of light would be frozen in time. To the person traveling at the speed of light, things would seem normal.
ANY light traveling through the same medium (stuff) has the same speed.
photons
80% of the speed of light in vacuum is 239,833,966.4 meters per second.
the same as you were if you weren't.
Heat waves traveling at the speed of light are called RADIATION! :)
Speed. All photons traveling through a vacuum travel at the speed of light.
That would depend on the medium which the light is traveling through.
It has no acceleration. The definition of acceleration is the change in velocity over time, so if it is traveling at a constant speed, it has no acceleration. Also, the speed of light is a constant, which means it does not change.