What is relative motion?

Relative motion is the motion of an object from the perspective of another moving object.

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How do you calculate the relative motion of two objects moving towards each other along the same line?

To calculate the relative motion of two objects moving towards each other along the same line, add their speeds together.

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How do you calculate the relative motion of two objects moving in the same direction along the same line?

To calculate the relative motion of two objects moving in the same direction along the same line, subtract the speed of one object from the other.

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