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According to the teachers guide of combined mathematics we have perfectly elastic impacts when e = 1 with no loss of kinetic energy in the system and inelastic impacts when e = 0 . According to the physics we have elastic impacts when there is no loss of kinetic energy in the system and inelastic impacts when there is loss of kinetic energy. There we have perfectly inelastic impacts when objects combined after the impact and move as one object. Since this topic actually comes under physics how can you compare these differences and what would be the best way to explain this to our students.

Thank you very much Madam for your suggestions, my first issue is in physics elastic impacts is defined as an impact with no loss of kinetic energy but in combined mathematics students are asked to find loss of kinetic energy in elastic impacts and only in perfectly elastic impacts we say there is no loss of kinetic energy. My second issue is in physics there are two cases inelastic impacts and perfectly inelastic impacts but in combined mathematics we have only inelastic impacts. According to my knowledge you can not always say objects are combined and move together after inelastic impacts. If a ball is dropped to the horizontal floor it remains at rest, if it is dropped to inclined plane it moves downwards along the plane after inelastic impact. It is interesting to know how can you describe these situations related to two terms in physics because we have only one term in combined mathematics.

This answer was edited.This answer was edited.Inelastic (e=0) and perfectly elastic (e=1) are the two extreme cases, and if you just say elastic it means 0<e<1 and in such cases, of course there is some loss of KE.