A 4kg block moves with a velocity of −2i^+3j^m/s. What is the magnitude of the velocity of its center of mass?
For a single object, the center of mass velocity equals the object’s velocity. Magnitude = (−2)2+(3)2 = 4+9 = 13≈3.6m/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 3.6 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.