00. VECTORS (HM)
Explanation:
The cross product \(\vec{A} \times \vec{B}\) is a vector, with its direction perpendicular to both \(\vec{A}\) and \(\vec{B} . \vec{A} \times \vec{B}\) is area. If side \(B\) is zero, area is zero. \(\vec{A} \times 0\) is a zero vector.
If in case \(0\) is a scalar, then also the product is zero. But a scalar \(\times\) a vector is also a vector.