Let $\vec v$ and $\vec a$ denote the velocity and acceleration respectively of a body in one-dimensional motion. Which of the following statements is correct regarding the speed of the body?
- A$|\vec v|$ must decrease when $\vec a < 0$
- BSpeed will decrease when $\vec v > 0$ and $\vec a < 0$
- CSpeed will increase when both $\vec v < 0$ and $\vec a < 0$
- DBoth $(B)$ and $(C)$
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