Which of the following statements are true? (Select ALL thatapply.) Thevelocity

Question

Which of the following statements are true? (Select ALL thatapply.) Thevelocity of the center of mass of a system changes only when thereis a net external force on the system. For thetotal linear momentum of a system to be conserved, there must be noexternal forces acting on the system.
Thetotal linear momentum of a system may be conserved even when themechanical energy of the system is not.
None ofthese statements are true. Thevelocity of the center of mass of a system changes only when thereis a net external force on the system. For thetotal linear momentum of a system to be conserved, there must be noexternal forces acting on the system.
Thetotal linear momentum of a system may be conserved even when themechanical energy of the system is not.
None ofthese statements are true.

Explanation / Answer

The velocity of the center of the mass of a system changesonly when there is a net external force on the system The total linear momentum of a system may be conserved evenwhen the ME of the system is not

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