A 5kg mass rotates in a circle of radius 0.4m with a speed of 3m/s. What is its angular momentum about the center?
L = mvr. m = 5kg, v = 3m/s, r = 0.4m. L = 5×3×0.4 = 6kg m2/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 6.0 kg m²/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.
