A $120 \,m$ long train is moving towards west with a speed of $10\, m/s$. A bird flying towards east with a speed of $5\, m/s$ crosses the train. The time taken by the bird to cross the train will be........$sec$
A $120 \,m$ long train is moving towards west with a speed of $10\, m/s$. A bird flying towards east with a speed of $5\, m/s$ crosses the train. The time taken by the bird to cross the train will be........$sec$
$16$
$12$
$10$
$8 $
A $120 \,m$ long train is moving towards west with a speed of $10\, m/s$. A bird flying towards east with a speed of $5\, m/s$ crosses the train. The time taken by the bird to cross the train will be........$sec$
Relative velocity $ = 10 + 5 = 15\,m/s$.
Time taken by the bird to cross the train$ = \frac{{120}}{{15}} = 8\sec $
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