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Question
Two people are on a train that is moving at 10 m/s north. They are walking 1 m/s south relative to the train. Relative to the ground, their motion is 9 m/s north.
Why are we able to use these motions to describe the motion relative to the ground?
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Responses
The motion of everything in the Universe besides light can be described in this way.
The motion of everything in the Universe besides light can be described in this way.
As long as the frame of reference is stationary, all motion can be described in this way.
As long as the frame of reference is stationary, all motion can be described in this way.
The people are moving much slower than the speed of light so the ground acts as a frame of reference.
The people are moving much slower than the speed of light so the ground acts as a frame of reference.
If one object is moving much slower than the speed of light, its speed can be added to that of another object.
1 answer
The correct response to the question is:
If one object is moving much slower than the speed of light, its speed can be added to that of another object.
This statement accurately reflects the principle of classical mechanics, where velocities can be added together when the speeds involved are much smaller than the speed of light, allowing us to analyze motion relative to a stationary frame of reference, such as the ground in this scenario.
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