Question

What's coefficient to Restitution??

Answer 1

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The coefficient of restitution (COR) measures the elasticity of a pair of objects in collision and the ratio of their final relative speed to their initial   relative speed. Determined through an experimentation, the coefficient of restitution essentially measures bounciness. If the coefficients close to one, then the collision is elastic and bouncy, if it is close to zero then collision is more elastic. Most professional sports have specific guidelines for the coefficient of restitution of equipment, such as balls, clubs and rackets. Otherwise known as Newton's law of impact, the coefficient of restitution is determined through experimentation. The coefficient of restitution formula for objects that collide is defined as $\bf{e=\frac{(v2-v1)}{(u2-u1)}}$, where u1 and u2 are the velocities before collision and v1 and v2 are the velocities after collision of each object respectively. To determine the COR of an object dropped into a stationary object such as the floor or a table the formula is $\bf{e=\sqrt\frac{bounce\;height}{drop\;height}}$. Velocities of objects moving horizontally or obliquely may be difficult to measure.

Answer 2

$\textbf{Answer is in attachment!}$