Yes, photons do.
Yes it is..Therotically no object can move in the speed of light.But now scientists are trying to find the conditions for which a particle can move in the speed of light. No, anything massless can (and must!) move at c. No object carrying mass can ever move at c.
The speed of an object can be anything between zero, and close to the speed of light (300,000 kilometers/second).
No object that has mass when it's just sitting there on the table can move at the speed of light. Photons have zero "rest mass".
An object that normally doesn't move at light speed (so, this doesn't include photons for example) CANNOT move at the speed of light. As it approaches the speed of light, its mass will get higher and higher (and tend towards infinity); as will the energy required to continue speeding it up.
No. No object can move faster then light. However, Minato Namikaze (the Fourth Hokage) and Uchiha Madara posses the ability to move at speed nearing the speed or light, or the speed of light itself, utilizing the space-time ninjutsu.
The maximum speed of any object is hardly equal to speed of light which is 3*10^8 approximately.
Time required to do what? To move from one place to another, divide the distance by the speed of light.
The slowest speed an object can move is zero.
That's related to the fact that it moves at the speed of light. If you look at the formula for mass increase as a function of speed, it should be obvious that the mass of anything that has a non-zero (i.e., positive) rest mass would approach infinity as the object approaches the speed of light - meaning that the speed of light itself can never be reached, since that would give the object an infinite mass (and require an infinite energy). The only way an object can move at the speed of light is for it to have a rest mass zero. In a way, this is hypothetical, since particles such as the photon or graviton, that move at the speed of light, can only move at the speed of light.
Shadows are not physical objects that can move or have speed, as they are the result of an object blocking light. The speed of a shadow depends on the speed of the object creating it and the distance between the object and the surface where the shadow is being cast.
An object will move at constant speed until acted upon by a force.
Note that there are particles, like photons and gravitons, that only move at the speed of light. For "normal" objects , the following problems appear:1) The mass will increase indefinitely - at the speed of light, an object would have an infinite mass.2) Related to the previous point: it would require an infinite energy to take the object to the speed of light.3) The addition of speeds doesn't work out. If - for example - a rocket moves at 2/3 of the speed of light (with respect to Earth), and it fires a bullet in the "forward" direction, at 2/3 of the speed of light (with respect to the rocket), then the speed of the bullet with respect to Earth would be less than the speed of light. It looks as if this makes it difficult to come up with a mechanism to make anything move as fast as, or faster than, the speed of light.