What is the speed of a man who is walking(say 8km/hour) in a train (moving at 100km/hr)?Are speeds added???

Answer 1

According to classical physics, since the man is walking inside the train his speed is relative to the train. Therefore if he is walking in the direction of the train motion, then for an observer outside the train the speeds are added. If he is walking in the opposite direction then for the same observer the man is moving at the difference of speeds.

According to relativity (special) there is a correction to the classical physics addition and subtraction, but at those speeds the correction is negligible. This (addition/ subtraction) would not be true (for example) if the man was shining light out of a flash light on a train.

Answer 2

Really you need to deal in velocity and not Speed. Speed has no direction and therefore no reference point. A velocity is a vector and so has a point of reference.

If you relate it to the ground then yes the velocities are added.
If two people start at the back of a train and one moves to the front he would cross a line on the track before the guy in the back.
He is therefore travelling at 8km/hour in the train ant 108km hour on the track, whereas his mate is only going at 100kmhour.

You have to note here though that there is a limit to the length of the train, and at some point he would want to move back to his seat. At this time he will be travelling at 8km hour in the opposite direction so only 92Km/hour along the track, thus allowing his lazy friend travelling at 100km hour to effectively catch him up.

Answer 3

For an observer on the platform, the man will appear to be walking with a speed of 108 km/hr, when walking in the same direction as that of train and backing at 92 km/hr when he walks in the opposite direction. Speeds can be added algebraically.

Answer 4

Relative velocity: If your walking inthe same direction as the train then the relative velocity in comparison someone standing on the platform is 108Km/hr but relative to someone else on the same train it is still only 8Km/hour. Of course if walking at an angle vector analysis is required. But basically Yes.

Answer 5

I assume you mean the speed relative to a stationary observer outside the train.

If the man is walking in a direction opposite to the way the train is moving, a stationary outside observer would say his speed is 92 km/hr

If the man is walking in the same direction that the train is going, a stationary outside observer would say his speed is 108 km/hr

Answer 6

vehicles are designed to circumvent injuries (they have steerage and extremely good brakes). also they are designed to do as little harm to the article/man or woman they hit as conceivable. Trains aren't any more, as only an complete pillock performing illegally would ever be of their way. a guy status on the tracks would bypass from table sure to the speed of the prepare in a chop up second. For an theory of what this does to a body, watch a slow action video of the ball in a tennis serve. The prepare would slow in no measurable way using collision. For an illustration of this, watch the video of a prepare hitting a automobile on youtube.

Answer 7

The speed is added if he is moving in the same direction as the train.

Answer 8

It all depends on how you want to look at it.

You could add both speeds together... you could also add the speed that the Earth is rotating, and the speed it travels around the sun, and the speed that the sun travels round our galaxy, and the speed at which our galaxy travels through the universe.

I would stick to 8km/hour

Answer 9

Depends relatively on the observer's position,
If the observer is on the train, the speed would be 8 kmph (relative to the train),
If observer is on the ground, it will b 108kmph(relative to ground if he is walking in the same direction as the motion of the train)
IF he is walikng in the opposite direction, his speed will be 92kmph relative to the ground

Answer 10

your speed relative to ground:
108km/hour if you are walking in the same direction of the train movement.
92km/hour if you r walking opposite direction.
Your speed relative to the train is:8km/hour.