Mathematics for IGCSE & O level - Vectors (Section 1 - No. 4)
If \(\vec{a} = 4\vec{b}\), what can you conclude about vectors \(\vec{a}\) and \(\vec{b}\)?
They are perpendicular.
They have the same direction.
They have opposite directions.
They have the same magnitude.
解释
Multiplying a vector by a scalar changes the magnitude. If the scalar is positive, the direction remains the same.