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A fish rising up vertically toward the ...

A fish rising up vertically toward the surface of water with speed `3ms^(-1)` observes a bird diving down vertically towards it with speed `9ms^(-1)` . The actual velocity of bird is

A

`4.5 ms^(-1)`

B

`5 ms^(-1)`

C

`3.0 ms^(-1)`

D

`3.4 ms^(-1)`

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The correct Answer is:
a
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