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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Relative Motion

  • question_answer
    A 210 meter long train is moving due North at a of 25m/s. A small bird is flying due South a little above the train with speed 5m/s. The time taken by the bird to cross the train is                 [AMU (Med.) 2001]

    A)          \[6s\]                             

    B)          \[7s\]

    C)          \[9s\]                             

    D)          \[10s\]

    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 \[t=\frac{210}{30}=7\ sec\]


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