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Describe the collision between particles? Collision between particles is defined as : 1. The mutual interaction of the particle for a small interval of time due to which both the energy and momentum of the interacting particle change. 2. There are so many examples of collision from our day to day life e.g., collision between two gaseous  atoms  at room temperature. 3. It is not necessary for two bodies undergoing collision to have physical with contact with each other. In case of Rutherford’s α-particle scattering experiment, α-particles were scattered due to electrostatic interaction between α-particle and the nucleus separated by some  distance . Hence, in Physics a collision will take place if either of the two bodies comes in physical contact with each other or even when path of one body is affected by the force exerted due to the other. 4. Collision between two particles are broadly categorized into two types: A)  Elastic Col...