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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?

The motion of everything in the Universe besides light 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.

As long as the frame of reference is stationary, all motion can be described in this way.

If one object is moving much slower than the speed of light, its speed can be added to that of another object.

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5 answers

  1. 1. Nitrogen and hydrogen combine at the same rate that ammonia breaks down.
    2. Both calcium carbonate and sodium carbonate are being produced.
    3. The reaction is reversible.
    4. 300,000 km/s
    5. The people are moving much slower than the speed of light so the ground acts as a frame of reference.

    merry christmas

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  2. The correct answer is the people are moving much slower than the speed of light so the ground acts as a frame of reference.

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  3. thank school balls all of theme are correct. you saved my life. thank you soo much. have a grate day.

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  4. School balls is right. I’m in connexus force and motion concepts quick check

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  5. lego's answers are 100% :)

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