Q. In absence of external forces, the velocity of center of mass is

बाह्य बलों की अनुपस्थिति में द्रव्यमान के केन्द्र का वेग होता है

A
Constant
स्थिर
B
Increasing
की बढ़ती
C
Decreasing
घटाना
D
Zero
शून्य

Explanation

If there are no external forces acting on a system, then the total momentum of the system is conserved. Since momentum = mass × velocity, and mass is constant, the velocity of the center of mass remains constant (both magnitude and direction).

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