A 3kg object moves with a velocity of −5i^−2j^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 = (−5)2+(−2)2 = 25+4 = 29≈5.39m/s. As per NCERT, applying relevant law/formula with correct units and sign convention leads to 5.39 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.