A particle in a rigid body rotates about a fixed axis at a distance of 0.8m with an angular velocity of 5rad/s. What is
Linear speed: v = ωr. ω = 5rad/s, r = 0.8m. v = 5×0.8 = 4m/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 4 m/s. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.