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For any arbitrary motion in space, which of the
\( \mathrm{P} \)
following relations is true?
W
(1) \( \vec{v}_{\text {average }}=\frac{1}{2}\left[\vec{v}\left(t_{1}\right)+\vec{v}\left(t_{2}\right)\right] \)
(2) \( \vec{v}_{\text {average }}=\frac{\vec{r}\left(t_{2}\right)-\vec{r}\left(t_{1}\right)}{t_{2}-t_{1}} \)
(3) \( \vec{v}(t)=\vec{v}(0)+\vec{a} t \)
(4) \( \vec{r}(t)=\vec{r}(0)+\vec{v}(0) t+\frac{1}{2} \vec{a} t^{2} \)


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