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Q. If a particle moves from point $P(2,3,5)$ to point $Q(3,4,5)$. Its displacement vector be

Motion in a Plane

Solution:

Displacement vector $\vec{r}=\Delta x \hat{i}+\Delta y \hat{j}+\Delta z \hat{k}$
$=(3-2) \hat{i}+(4-3) \hat{j}+(5-5) \hat{k}=\hat{i}+\hat{j}$