[الصادق]

المشكلة انكم تتحدثون عن كرة واحدة ولكى يكون مثال خذ وهات اقرب للواقع اظن انه يجب ان تكون لدينا كرتان وبالتالى تكون العملية هى عملية تبادل exchange

Ok let us think about it ,this way
Let us imagine two boys exchanging balls if they throw the balls at each other, the boys move backward, and when they catch the balls thrown at them, their backward momentum increases. Thus this method of exchanging balls yields the same effect as the repulsive force between the boys
If the boys snatch the balls from each other's hands, however , the result will be
equivalent to an attractive force acting between them
I think this model is more physical, elgent ,and it fit nicely with Rashwan's
explantions.my thanks goes to Rashwan for his uncomparable way of explaning physics, and goes also to elmutafisique