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A vector is described by $\vec{A}$ $= A_{x} \hat{i} + A_{y} \hat{j} + A_{z} \hat{k}$ , then $A_{y}$ is a scalar.
Reason (R) : The projection of a vector is a scalar

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detailed solution

Correct option is A

The projection of vector like $A_{x}, A_{y}, A_{z}$ are scalars.

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A vector is described by A→=Axi^+Ayj^+Azk^, then Ay is a scalar.Reason (R) : The projection of a vector is a scalar