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AMU Medical AMU Solved Paper-1999

  • question_answer
    A 20 kg block is initially at rest on a rough horizontal surface. A horizontal force of 75 N is required to set the block in motion. After it is in motion, a horizontal force of 60 N is required to keep the block moving with constant speed. The coefficient of static friction is

    A)  0.38              

    B)  0.44

    C)  0.52              

    D)  0.60

    Correct Answer: A

    Solution :

    : \[F=\mu R=\mu Mg\] \[75=\mu \times 20\times 10\]for static friction \[\mu =\frac{75}{200}=0.38\]


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