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

  • question_answer
    An object thrown vertically upwards from the top of a tower of height 39.2 m reaches the ground in 4 s. Find the velocity with which it is thrown upwards.

    Answer:

    \[-h=ut-\frac{1}{2}g{{t}^{2}}\] \[\Rightarrow -39.2=4u-4.9\times 4\times 4\] \[\Rightarrow 39.2=4u\] \[\Rightarrow u=9.8\,\,m/{{s}^{2}}\]


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