The speed of light in vacuum is 299,792,458 meters per second, and that's not an average. That's what it always is.
About 2/3 its speed in a vacuum.
3/4th
There are several different types of glass, and light has a somewhat different speed in each of them. On the average, the speed of light across all typical types of glass is in the neighborhood of 2/3 its speed in vacuum, or around 200,000 km/sec .
Depends on your average speed. Distance = Speed*Time. If travelling at the speed of light, 1.08 billion kilometres. If at the speed of a garden snail, 0.05 kilometers.
Only if you are a photon. In that case, you always move at the speed of light. If you're not a photon, and have any mass while you're sitting still, and are not moving at the speed of light right now, then you can never attain light speed.
The speed of light in vacuum is 299,792,458 meters per second, and that's not an average. That's what it always is.
No material object ever moves at the speed of light. The Earth's speed in its solar orbit ... relative to a foolish astronomer sitting on the sun ... is about 29.78 kilometers per second. That's about 0.0001 of the speed of light.
The speed of light in a vacuum is about 300,000,000 kilometers per second. Since light can't travel at any other speed (in a vacuum), that's also the average speed.
About 2/3 its speed in a vacuum.
3/4th
There are several different types of glass, and light has a somewhat different speed in each of them. On the average, the speed of light across all typical types of glass is in the neighborhood of 2/3 its speed in vacuum, or around 200,000 km/sec .
The average speed of light in a vacuum is approximately 299,792 kilometers per second or about 186,282 miles per second. This speed is considered a constant in physics and plays a crucial role in understanding various phenomena in the universe.
It depends what you are sitting on or in.
Massless particles traveling at the speed of light include photons, the particles of light. They have no rest mass and always move at the speed of light in a vacuum according to the theory of special relativity.
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".
Non-examples of average speed would include instantaneous speed at a single moment in time, maximum speed achieved during a journey, and the distance traveled in total without considering time.