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  5. Time and Motion

9th Class Science Time and Motion Question Bank Motion

  • question_answer
    A car of mass 1000 kg moves on a circular track of radius 20 m. If the coefficient of friction is 0.64, then what is the maximum velocity with which the car can be moved?

    A)  112 m/s           

    B)         11.2 m/s  

    C)  \[\frac{0.64\times 20}{1000}m/s\]

    D)         \[\frac{1000}{0.64\times 20}m/s\]

    Correct Answer: B

    Solution :

     \[{{v}_{\max }}=\sqrt{\mu gr}\]\[=\sqrt{0.64\times 9.4\times 20}=\mathbf{11}\mathbf{.2}\,\,\mathbf{m/s}\]


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