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Questions  >>  CBSE XI  >>  Physics
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Q)

A 210 m long train is moving north at a speed of $25\;m/s$. A small bird is flying south a little above the train with speed of $5m/s$. The time after which the bird crosses the train is :

$\begin{array}{1 1} (a) \;6\;sec \\ (b) \;8\;sec\\ (c) \;7\;sec \\ (d) \;12\;sec\end{array} $

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A)
Solution :n
Relative velocity of bird w.r.t train
$\qquad=25+5$
$\qquad= 30 m/s$
Time taken $=\large\frac{Distance}{Speed}$
$\qquad= \large\frac{210}{30}$$=7\;s$
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