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 mass of asystem changes only when there is a net external force on thesystem.

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