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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

`9.2ms^(-1)`

B

`4.5ms^(-1)`

C

`9ms^(-1)`

D

`3.2ms^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
B
Apparent distance of bird as seen by fish
`h=x + muy (dh)/(dx) + mu (dx)/(dt) + mu (dy)/(dt)9=3+mu (dy)/(dt)`
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