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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Mock Test - Motion in one Dimension

  • question_answer
    A drunkard is walking along a straight road. He takes five steps forward and three steps backward and so on. Each step is 1 m long and takes 1 s. There is a pit on the road 11 m away from the starting point. The drunkard will fall into the pit after

    A) 29 s                 

    B) 21 s

    C) 37 s                 

    D) 31 s

    Correct Answer: A

    Solution :

    [a] since the last five steps covering 5 m land the drunkard fell into the pit, the displacement prior to this is (11-5) m=6m. time taken for first eight steps (displacement in first eight steps=5-3=2 m)=8 s. then time taken to cover first 6 m of journey \[=\frac{6}{2}\times 8=24s\] Time taken to cover last 5 m =5 s Total time = 24+5 =29 s


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