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A bird is flying towards north with a ve...

A bird is flying towards north with a velocity `40 km h^-1` and a train is moving with velocity `40 km h^-1` towards east. What is the velocity of the bird boted by a man in the train ?

A

`40sqrt(3)km h^(-1) N-E`

B

`20sqrt(2)km h^(-1) S-E`

C

`40sqrt(2)kmh^(-1) N-W`

D

`40 km h^(-1)S-W`

Text Solution

Verified by Experts

The correct Answer is:
c
Here `overset(rarr)v_(B)=40 hatj overset(rarr)v_(r )=40 hat I | overset(rarr)b_(B//T)|=overset(rarr)v_(B)-overset(rarr)v_(r )=40 hat j-40 hati=sqrt(40^(@)+40^(@))=40sqrt(2)` km `h^(-1)` north - west
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