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Two particles A and B are moving in XY p...

Two particles A and B are moving in XY plane. Particle A moves along a line with equation `y =x` while B moves along X axis such that their X coordinates are always equal. If B moves with a uniform speed 3 m/s the speed of A is

A

`3sqrt2 ms^(-1)`

B

`3/sqrt2 ms^(-1)`

C

`1/3 ms^(-1)`

D

`3ms^(-1)`

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The correct Answer is:
A
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