The nature of a vector may or may not be changed when it is multiplied.

For example, when a vector is multiplied by a pure number like 1, 2, 3, … etc., then the nature of the vector does not change.

On the other hand, when a vector is multiplied by. a scalar physical quantity, then the nature of the vector changes. For example, when acceleration (vector) is multiplied by mass (scalar) of a body, then it gives force (a vector quantity) whose nature is different than acceleration.

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