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NEET Sample Paper NEET Sample Test Paper-87

  • question_answer
    Three masses are placed on the x-axis, mass of 300 g at origin, 500 g at x = 40 cm and 400 g at x = 70 cm. The distance of the centre of mass from the origin is

    A) 40 cm

    B)                    45 cm

    C) 50 cm  

    D)        30 cm

    Correct Answer: A

    Solution :

    [a] \[{{X}_{cm}}=\frac{{{m}_{1}}{{x}_{1}}+{{m}_{2}}{{x}_{2}}+{{m}_{2}}{{x}_{3}}}{{{m}_{1}}+{{m}_{2}}+{{m}_{3}}}\] \[{{X}_{cm}}=\frac{300\times (0)+500(40)+400\times 70}{300+500+400}\] \[{{X}_{cm}}=\frac{500\times 40+400\times 70}{1200}=40\,cm\]


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