If $\bar{x}$ is a non-zero vector and $k > 0, k \neq 1$,then $\frac{-k \bar{x}}{|\bar{x}|}$ is $.......$ .
- Aunit vector in the direction of $\bar{x}$
- Bin the direction of $\bar{x}$ having magnitude $k$
- Cin the opposite direction of $\bar{x}$ having magnitude $k$
- Dunit vector in the opposite direction of $\bar{x}$
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$A$ vector $\vec{a}$ has components $2p$ and $1$ with respect to a rectangular Cartesian system. This system is rotated through a certain angle about the origin in the counter-clockwise sense. If,with respect to the new system,$\vec{a}$ has components $p+1$ and $1$,then:
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