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1) what is the coieficcient of restiution . is there any mathematical formula rel to ht a ball can rise? 2)How is the intensities of 2 stars rel?

The degree of elasticity of a collision is determined by a quantity called coeffecient of restitution or coeffecient of resilience of the collision.It is defined as the ratio of relative velocity of separation after collision to the relative velocity of separation after collision to the relative velocity of approach before collision.It is represented by e.

e = relative velocity of separation(after collision) / relative velocity of approach (before collision)

e = v₂ - v₁ / u₁ -u₂

where u₁,u₂ are velocities of two bodies before collision, and v₁,v₂ are their respective velocities after collision.

For a perfectly elastic collision ,relative velocity of separation after collision is equal to relative velocity of approach before collision.

:.                                    e = 1