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3-1.Vectors
easy
If $A$ is a unit vector in a given direction, then the value of $\hat{ A } \cdot \frac{d \hat{ A }}{d t}$ is
A$0$
B$1$
C$\frac{1}{2}$
D$2$
Solution
(a)
Since,$A$ is a unit vector in a given direction. It should be a constant unit vector.
$\text { or } \quad \frac{d A }{d t}=0$
Since,$A$ is a unit vector in a given direction. It should be a constant unit vector.
$\text { or } \quad \frac{d A }{d t}=0$
Standard 11
Physics
