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    Question

    A stone thrown upward with a speed тАЩuтАЩ from the top

    of the tower reaches the ground with a speed тАШ3uтАЩ. The height of the tower is-
    A 4u┬▓/g Correct Answer Incorrect Answer
    B 2u┬▓/g Correct Answer Incorrect Answer
    C 6u┬▓/g Correct Answer Incorrect Answer
    D 9u┬▓/g Correct Answer Incorrect Answer

    Solution

    v2 = u2 + 2gh ├Ю (3u)2 = (-u)2 + 2gh [тАШ-тАШ sign indicates that the direction of stone is against gravity] ├Ю h = (9u2 - u2)/ 2g ┬а┬а = 8u2/2g ├Ю H= 4u2/g

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