We know vectors are multiplied with one another. However, vectors can also be multiplied by a scalar. For example, when we find the momentum of a moving object, we multiply its mass with the velocity. Needless to say that velocity is a vector quantity and mass is a scalar.

A vector is multiplied by a scalar by multiplying the magnitude of the vector by the scalar and its direction depends upon the sign of the scalar. Thus the product of a scalar with a vector is a vector quantity. Similarly, the result (the product vector) is also related with the original vector.

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