V 1 = linear velocity of the racquet mass center before impact In other words, the difference in the velocities of the two colliding objects after the collision, divided by the difference in their velocities before the collision. The coefficient of restitution is the ratio of the differences in velocities before and after the collision. So the coefficient of restitution will always be between zero and one. Example: two lumps of clay that don’t bounce at all, but stick together. A perfectly plastic, or inelastic, collision has c = 0. Example: two diamonds bouncing off each other. With an inelastic collision, some kinetic energy is transformed into deformation of the material, heat, sound, and other forms of energy, and is therefore unavailable for use in moving.Ī perfectly elastic collision has a coefficient of restitution of 1. Elasticity is a measure of how much bounce there is, or in other words, how much of the kinetic energy of the colliding objects before the collision remains as kinetic energy of the objects after the collision. The coefficient of restitution (denoted by the symbol c in our formulas) is a measure of the elasticity of the collision between ball and racquet.
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