Practice question

I = MR2 = 2×(0.5)2 = 0.5kg m2. K = 12Iω2⇒10 = 12×0.5×ω2⇒20 = 0.5ω2⇒ω2 = 40⇒ω = 40≈6.32rad/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 6.32 rad/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.