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A 210 meter long train is moving due nor...

A 210 meter long train is moving due north at a of 25 m/s. a small bird is flying due south a little above the train with speed 5 m/s. The time taken by the bird to cross the train is

A

6s

B

7s

C

9s

D

10s

Text Solution

Verified by Experts

The correct Answer is:
B
Relative velocity of the bird `=25-(-5)`
`=30 m//s`
Distance =210m
`therefore=("Distance")/("velocity")=(210)/(30)=7` sec
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ALLEN-MOTION IN A PALNE-EXERCISE-1
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  2. A particle moves in east direction with 15m/sec for 2 sec then moves i...

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