Two particles A and B are moving in XY plane.
Particle A moves along a line with equation \( y=x \)
\( \mathrm{P} \) while \( \mathrm{B} \) moves along \( \mathrm{X} \) axis such that their \( \mathrm{X} \)
W coordinates are always equal. If \( \mathrm{B} \) moves with a uniform speed \( 3 \mathrm{~m} / \mathrm{s} \), the speed of \( A \) is
(1) \( 3 \mathrm{~m} / \mathrm{s} \)
(2) \( \frac{1}{3} \mathrm{~m} / \mathrm{s} \)
(3) \( 3 \sqrt{2} \mathrm{~m} / \mathrm{s} \)
(4) \( \frac{3}{\sqrt{2}} \mathrm{~m} / \mathrm{s} \)
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