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AMU Medical AMU Solved Paper-1995

  • question_answer
    A body of mass 100 g stops after travelling a certain distance on a rough horizontal surface. If its initial speed was 200 cm/s, the work done by it against the force of friction is

    A)  \[-0.2\text{ }J\]

    B)  \[+0.2\text{ }J\]

    C)  cannot be calculated because the coefficient of friction is not given

    D)  cannot be calculated because the distance moved is not given

    Correct Answer: A

    Solution :

    : Work done by body = force\[\times \]distance in force direction = (mass of body\[\times \]acceleration)\[\times \]distance = mass\[\times \]increase in velocity \[=\left( \frac{100}{1000} \right)\times \left( \frac{-200}{100} \right)J=-0.2J\]


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