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A train of 150 m length is going toward ...

A train of `150 m` length is going toward north direction at a speed of `10 ms^-1`. A parrot flies at a speed of `5 ms^-1` toward south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to.

A

12 s

B

8 s

C

15 s

D

10 s

Text Solution

Verified by Experts

The correct Answer is:
D
Choose the positive direction of x-axis to be from south to north. Then
Velocity of train `v_(T) =+10 ms^(-1)` Relative velocity of parrot with respect to train
`=v_(p) -V_(T) (-5ms^(-1)) - (+10 ms ^(-1)) = - 15 ms ^(-1)`
i.e . Parrot appears to move with a speed of 15 m .. from north to south .
Time taken by the parrot to cross the train
`= (150 m)/(15 ms ^(-1)) = 10 s `
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