Part A

If vector vec$(A)$ has unity magnitude and makes an angle of $45$ with the $+x$ axis, then the $x$ and $y$ components of vec$(A)$ are

$A_x=A_y=1.$

$A_x=A_y=\frac{1}{2}.$

$A_x=A_y=\sqrt[\phantom{2}]{2}.$

$A_x=A_y=\frac{1}{\sqrt[\phantom{2}]{2}}.$

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