An object moves with constant acceleration a. Which of the following expressions are also consta...

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An object moves with constant acceleration a. Which of the following expressions are also constant ?
(a) \( \frac{d|\mathbf{v}|}{d t} \)
(b) \( \left|\frac{d \mathbf{v}}{d t}\right| \)
(c) \( \frac{d\left(v^{2}\right)}{d t} \)
(d) \( \frac{d\left(\frac{\mathbf{v}}{|\mathbf{v}|}\right)}{d t} \)
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