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  5. Motion in a Straight Line / सरल रेखा में गति

JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Sample Paper Topic Test - One Dimensional Motion

  • question_answer
    Balls are dropped from the roof of a tower at a fixed interval of time. At the time when 9th ball reaches the ground, nth ball is at 3/4th height of the tower. The value of n is

    A) 3

    B) 7

    C) 6

    D) 5

    Correct Answer: D

    Solution :

    [d]
    • \[H=\frac{1}{2}g{{\left( 9-1 \right)}^{2}}{{t}^{2}}\]                       ....(1)
    • \[\frac{H}{4}=\frac{1}{2}g{{\left( n-1 \right)}^{2}}{{t}^{2}}\] Solving equations (1) and (2), we get \[n=5\].


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