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If $\hat{A}$ is a unit vector in a given direction, then the value of $\hat{A} \cdot \frac{d \hat{A}}{d t}$ is

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Correct option is A

Since, A^ is a unit vector in a given direction. It should be a constant unit vector.Therefore dA^dt= 0.Therefore , A^·dA^dt=0

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If A^ is a unit vector in a given direction, then the value of A^·dA^dt is

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If $\hat{A}$ is a unit vector in a given direction, then the value of $\hat{A} \cdot \frac{d \hat{A}}{d t}$ is