Kinematics Question 324
Question: A 150 m long train is moving to north at a speed of 10 m/s. A parrot flying towards south with a speed of 5 m/s crosses the train. The time taken by the parrot the cross to train would be: [CBSE PMT 1992]
Options:
A) 30 s
B) 15 s
C) 8 s
D) 10 s
Correct Answer: D Relative velocity of parrot with respect to train = $ 5-(-10)=5+10=15m/\sec $ Time taken by the parrot $ =\frac{d}{{v _{rel\text{.}}}}=\frac{150}{15}=10\sec . $
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