If u r on a train travelling at speed of light, and u run to the front, r u going faster than speed of light?

Answer 1

The context of this relativity business is that scientists could not figure out why(/how) the speed of radiation signals reaching a receiver was constant no matter what the speed of the transmitter.
So they needed an equation to muffle WHAT SHOULD BE THE SPEED OF LIGHT + AN ADDITIONAL SPEED. Einstein provided some credible maths equations that allowed light speed to always be constant and also to be the fastest speed that there can be. The trick is that the speed of something can be observed as being different by different observers. Observers can see the same event happen at different speeds but the rule of the maths is that no observer would ever see something happen than the speed of light. So an observer on the train sees a runner running at normal running speed. The observer outside the train would see merely the speed of light - nothing faster. The key to it is the context: a radio signal really is measured no faster than the speed of light. We just need some convenient maths to match theat real observation.

Answer 2

I agree with graemefirth.
If the train you were travelling on was going at the speed of light, time would be zero.
Example. If you travelled from the earth for 1000 years at the speed of light in a huge circle and came back to Earth you would not have aged a second (presuming you accelerated to light speed before the start line and decelerated after the finish line) but all your relatives and everyone else who you knew would be long gone because 1000 years has passed on Earth.
You CAN start running just before you hit light speed but you will be "frozen in time" for 1000 years (because you are travelling at light speed) and you will continue running when you start decelerating without realising that 1000 years have just passed.
You cannot go faster than the speed of light whether you are on a train or not.

Answer 3

I believe that any vehicle running on wheels has a theoretical maximum speed of half the speed of light.

Consider a wheel. It's average speed is the same as the vehicle (because it's attached to the vehicle), however, successive points on the circumference are momentarily stationary because the wheel is in contact with the ground and doesn't slip. The point diametrically opposite the stationary point is moving at TWICE the speed of the vehicle and since it is impossible for an object to move faster than the speed of light, the maximum speed a wheeled vehicle could possibly travel would be half the speed of light.

That doesn't answer your question but it proves that your question (with all due respect) cannot be answered.

Pearlsawme is also correct, of course. At the speed of light, the train would not have any length for you to run down (although you, on the train, would not observe that). It isn't called the Theory of RELATIVITY for nothing!

Answer 4

This question is interesting!

The answer is it depends.

Relative to the train you are only going a few metres a second.

Relative to someone watching you from the track side you are going faster than the speed of lite... faster than the train.

This is why Einstein was wrong about the ability to go faster than light. Why his theory proves he is wrong but people choose to ignore that part.

Relativity is the key.

If the train and a beam of light set off at the same time with you on it and you ran from the back of the train to the front then you would beat the light beam to the finish line.

Period.

Have fun! ;o)

Answer 5

No, you're still going at the speed of light. SoL is a universal constant that cannot be breached, only in certain circumstances. Far out stuff. And if a train ever gets to travel at such a speed, my cryogenically frozen brain will be thawed the day before and I will be checking for tickets.

Answer 6

Well, your train cannot go at the speed of light. So thats an end to your question.

But if you were on a train going at 100 km/h relative to the ground and you ran at 10 km/h you would be going at 110 km/h relative to the ground (roughly).

If you were on the same train and shone a flashlight forward so photons fired out from it at c relative to you, they would be travelling at c relative to the ground too - not at c + 100 km/h.

This result was first measured by Michelson and thn Morley at the end of the 19th century. Though counterintuitive it is the result that led to the special theory of relativity.

Everything you thought you knew about space and time is wrong.

Answer 7

If a train could travel at the speed of light and if someone could observe you trying to run from the back to the front of train this is what the outside observer would see.

Nothing.......all they will see is you stood at the back of the train.

You on the other hand, if you could see the observer would see observer grow old and die in matter of seconds (if observer waited round long enough ie. all his life. to see if you were going to start running)

Confused? Everybody should be as it is outside of our normal expeiriance.

The fact is that at the speed of light, time slows to a standstill.
From your point of view on the train time travels normally and time on the outside is whizzing by at phenomanal rate.
The observer expieriance time normal also but see's your time frame at standstill.
You ran to the front of the train it took you millions of years to get there(from the outside observers point of view) You did not travel faster than the speed of light.

The speed of light is constant . . . . . time is the variable.

Hope this helps it still confuses me

Answer 8

Material objects like train cannot attain the speed of light. Even if you imagine that one exists, then the train's length becomes zero. In that case it has no front or back. You, the engine and the last compartment all will reduce to a length zero.

Answer 9

you are moving at the speed of light and not faster because even if you are immobile and the train stops suddenly you will move forward at the velocity of the train which is the speed of light in this case

Answer 10

relative to the train, you wouldn't be travelling faster than light.

HOWEVER, relative to the rest of the world, you WOULD be travelling faster than the speed of light... since that is impossible.. the entire physical universe would explode except for the train