9th Class Science Gravitation and Floatation Question Bank Gravitation Conceptive Subjective Problems

  • question_answer
    A body is dropped from a balloon moving up when it is at a height of 74.4. If it takes 6 sec to reach the ground, what is the velocity of the balloon?

    Answer:

    \[-h=ut-\frac{1}{2}g{{t}^{2}}\] i.e., \[-74.4=6u-\frac{1}{2}\times 9.8\times 36\] \[\therefore \,\,176.4-74.4=102=6a\,\,or\] \[u=17m/s.\]


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