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

  • question_answer
    A 120 m long train is moving in a direction with speed 20 m/s. A train B moving with 30 m/s in the opposite direction and 130 m long crosses the first train in a time [CPMT 1996; Kerala PET 2002]

    A)          \[6\,s\]                           

    B)          36 s

    C)          38 s                               

    D)          None of these

    Correct Answer: D

    Solution :

               Total distance \[=130+120=250\ m\] Relative velocity \[=30-(-20)=50\ m/s\] Hence \[t=250/50=5s\]


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