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  4. Which of the following potential energy curves possibly describe the elastic collision of two billiard balls? Here r is the distance between centres of the balls.

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Q. Which of the following potential energy curves possibly describe the elastic collision of two billiard balls?
Here $ r $ is the distance between centres of the balls.

Work, Energy and Power

Solution:

Here the potential energy of a system of two masses exists only during collision. This potential energy is due to deformation.