When are magnitudes of two vectors added?

when the vectors have the same direction

when the vectors have equal magnitudes

when the vectors have the opposite direction

When the vectors have the same direction

Explanation:

When vectors have the same direction their magnitude can be simply added to find a resultant vector with the same direction as the first two vectors.

Having the same magnitude does not mean anything when it comes to adding vectors because they might have different directions not making it possible to just add their magnitude.

When vectors have opposite directions they can be subtracted from one another being that the resultant direction will be that of the vector with the highest magnitude.

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molecules are free to separate from each other and will take on the shape of the container. molecules move completely at random and high speeds. they vibrate in a fixed position and do not move around much. molecules expand to the edge of their container.