Which of the following potential energy curves in figure cannot describe the elastic collision of twobilliard balls ? Here r is the distance between centres of the balls .

Which of the following potential energy curves in figure cannot descri

1.	Which of the following potential energy curves in figure cannot describe the elastic collision of twobilliard balls ? Here r is the distance between centres of the balls .
Answer» Solution :Distance between centre of BALLS is 2R when both ball collide . During every elastic collision , the shape of ball slightly CHANGES . In elastic collision potential energy CONVERTED into kinetic energy . The potential energy of a system of two masses is inversely proportional to the separation between them . ` :.V prop 1/r` Out of the given graph , curve (v) only satisfies these two CONSITIONS .Therefore , all other curves cannot possibly describe the elastic collision of two billiard balls .