During a collision between a closed system of particle in the absence of exerted force

Options

A. The total kinetic energy of the system remain constant
B. The momentum of each particle remains constant
C. Momentum is exchanged between different particles
D. Momentum and kinetic energy both are exchanged between different particles

Answer

A

Explanation

Since external force are obsent, so the total momentum of the system remain constant. However, internal force may the momentum of each partical. But since internal forces are always equal and opposite , so the change in momentum (during any time interval corresponding to these force are also equal and opposite . In works, momentum is exchanged.