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........$s$
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........$s$
$6$
$7$
$9$
$10$
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........$s$
Relative velocity of bird w.r.t train $ = 25 + 5 = 30\;m/s$
time taken by the bird to cross the train $t = \frac{{210}}{{30}} = 7\;sec$