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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Self Evaluation Test - Motion in a Strainght Line

  • question_answer
    From a balloon moving upwards with a velocity of \[12\text{ }m{{s}^{-1}}\], a packet is released when it is at a height of 65 m from the ground. 7 lie time taken by it to reach the ground is \[(g=10\text{ }m{{s}^{-2}})\]

    A) 5s                    

    B) 8s

    C) 4s                    

    D) 7s

    Correct Answer: A

    Solution :

    \[s=ut+\frac{1}{2}a{{t}^{2}}\] \[-65=12t-5{{t}^{2}}\]on solving we get, t=5s


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