(chatquestion)...13. Which of the following potential energy curves can possible describe the elastic collision between two billiard balls (r is distance between centre of balls and Ris radius of balls). V(r)↑ V(r)1 (1) (2) fon 2 R 2 R V(り介 V(r) (3) (4) 2 R 2 Rr

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