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Q.

A fish rising vertically up towards the surface of water with speed 3 ms−1 observes a bird diving vertically down towards it with speed 9 ms−1. The actual velocity of bird is Given:μ=43

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a

45 ms−1

b

4.5 ms−1

c

3.0 ms−1

d

3.4 ms−1

answer is B.

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Detailed Solution

Effective height of the bird as seen by the fish, Y=y+μy'dydt=dydt+μdy'dt9=3+43dy'dtor  dy'dt=6×34=184=92=4.5ms−1∴Actual  velocity  of  bird=4.5ms−1
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