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4-1.Newton's Laws of Motion
easy
किसी निकाय का संवेग संरक्षित रहता है
A
हमेशा
B
कभी नहीं
C
जब तक निकाय पर कोई बाह्य बल न लगे
D
इनमें से कोई नहीं
Solution
The law of conservation of momentum says that the momentum of a closed system is constant in time (conserved). A closed (or isolated) system is defined to be one for which the mass remains constant, and the net external force is $zero$. The total momentum of a system is conserved only when the system is closed.
Standard 11
Physics