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3-1.Vectors
easy
If a particle moves from point $P (2,3,5)$ to point $Q (3,4,5)$. Its displacement vector be
A
$\hat i + \hat j + 10\hat k$
B
$\hat i + \hat j + 5\hat k$
C
$\hat i + \hat j$
D
$2\hat i + 4\hat j + 6\hat k$
Solution
(c) Displacement vector $\overrightarrow {r\,} = \Delta x\hat i + \Delta y\hat j + \Delta z\hat k$
$ = (3 – 2)\hat i + (4 – 3)\hat j + (5 – 5)\hat k$$ = \hat i + \hat j$
Standard 11
Physics