A train of length 500 metre equal along east direction with 15 metre per second. A bird is moving above it along west with speed 10 metre per second then find out the time taken by the bird to cross the train.
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Answered by
16
Solution :-
As given :-
The length of train = 500 m
Velocity of train = 15 m/s ( towards East)
Velocity of bird = 10 m/s (towards West)
In our first step we will find out the relative velocity.
Remember :- We will take the velocity of bird as positive if frame of reference is bird and the velocity of train as negative. And vise versa.
So relative Velocity
= 10 - (-15)
= 10 + 15
= 25 m/s
Now as length of the train
= 500
Then Time
= Distance ÷ Relative velocity
= 500 ÷ 25
= 20 sec
Answered by
8
Distance = 500 m
Speed = 15 + 10 = 25 m/sec
Time = Distance/Speed
= 500/25
= 20 sec
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