Kinematics Question 309
Question: A 210 meter long train is moving due North at a of 25m/s. A small bird it’s flying due South a little above the train with speed 5m/s. The time taken by the bird to cross the train it’s [AMU (Med.) 2001]
Options:
A) $ 6s $
B) $ 7s $
C) $ 9s $
D) $ 10s $
Show Answer
Answer:
Correct Answer: B
Solution:
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 $
