A train of $150 \mathrm{~m}$ length is going towards north direction at a speed of $10 \mathrm{~ms}^{-1}$. A…
A train of $150 \mathrm{~m}$ length is going towards north direction at a speed of $10 \mathrm{~ms}^{-1}$. A parrot flies at a speed of $5 \mathrm{~ms}^{-1}$ towards south direction parallel to the railway track. The time taken by the parrot to cross the train is equal to
$12 \mathrm{~s}$
$8 \mathrm{~s}$
$15 \mathrm{~s}$
$10 \mathrm{~s}$
Solution
So by figure the velocity of parrot w.r. t. train is $=5-(-10)=15 \mathrm{~m} / \mathrm{sec}$
so time taken to cross the train is
$=\frac{\text { length of train }}{\text { relative velocity }}=\frac{150}{15}=10 \mathrm{sec}$
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Asked in: JEE Mains - Motion In One Dimension - Test 4
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