Which of the following relation is correct for uniform circular mot...

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Which of the following relation is correct for uniform circular motion.
P
(1) \( \vec{a} \times \vec{v}=0 \)
(2) \( \vec{a} \cdot \vec{v}=0 \)
W
(3) \( \vec{a} \cdot \vec{v}=+v e \)
(4) \( \vec{a} \cdot \vec{v}=-v e \)
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