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MCQMediumJEE Main 2026 · 24 January, Shift 1Moment of Inertia & Radius of Gyration

Physics Question from JEE Main 2026 · 24 January, Shift 1

Two masses 400 g400\,g and 350 g350\,g are suspended from the ends of a light string passing over a heavy pulley of radius 2 cm2\,cm. When released from rest the heavier mass is observed to fall 81 cm81\,cm in 9 s9\,s. The rotational inertia of the pulley is _____ kg m2kg\, m^2.

(Given: g=9.8 m s−2g = 9.8\,m\, s^{-2})

  • A

    9.5×10−39.5 \times 10^{-3}

  • B

    1.86×10−21.86 \times 10^{-2}

  • C

    8.3×10−38.3 \times 10^{-3}

  • D

    4.75×10−34.75 \times 10^{-3}

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