A particle is executing uniform circular motion with velocity $\vec{v}$ and acceleration $\vec{a}$. Which of the following is true?

Question

$\vec{v}$ is a constant; $\vec{a}$ is not a constant

$\vec{v}$ is not a constant; $\vec{a}$ is not a constant

$\vec{v}$ is a constant; $\vec{a}$ is a constant

$\vec{v}$ is not a constant; $\vec{a}$ is a constant

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