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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A parachutist of weight w strikes the ground and comes to rest with an upward acceleration of magnitude 3 g. Force exerted on him by the ground during landing is

    A)  \[2w\]                                 

    B)  3 \[w\]

    C)  4 \[w\]                   

    D)         5 \[w\]

    Correct Answer: C

    Solution :

     Upward resultant acceleration is\[3\,\,g\]. Apparent acceleration on parachutist\[=3g+g=4g\] (Only in this situation the upward resultant acceleration can be\[3g\]) Force on parachutist\[=m\times 4g\] \[=4mg=\mathbf{4w}\]


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