An object moves with constant acceleration \( \vec{a} \). Which of the following expressions is/...

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An object moves with constant acceleration \( \vec{a} \). Which of the following expressions is/are also constant?
\( P \)
(1) \( \frac{d|\vec{v}|}{d t} \)
(2) \( \left|\frac{d \vec{v}}{d t}\right| \)
(3) \( \frac{d\left(v^{2}\right)}{d t} \)
(4) \( \frac{d(\vec{v} /|\vec{v}|)}{d t} \)
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