Which of the Following Statements Involve Notation, Unit, or Conceptual $A$

Short Answer

Which of the following statements involve notation, unit, or conceptual errors? For each statement, answer $A$ if the statement is acceptable, or $E$ if it is erroneous.
-If an object moves at a rate of $5 \mathrm{~m} / \mathrm{s}$ in the $-x$ direction, then $\vec{v}_{x}=-5 \mathrm{~m} / \mathrm{s}$ .