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True or False ?7. When two spheres with equal masses collide centrally and elastically, the spheres exchange their kinetic energies. 8. In each impact, the momentum of the colliding body system is marginally the same before and immediately after the impact, but varies during the impact. 

Sagot :

(7)

When two spheres with equal masses collide centrally and elastically, the spheres exchange their kinetic energies. This statement is a false statement.