1.

Define Coefficient of restitution

Answer»

Solution :Co-efficient of resitution is defined as the RATIO of velocity of SEPARATION (relative velocity) after COLLISION to the velocity of approach (relative velocity) before collision, i.E.,
` e = ("velocity of separation(after collision)")/("velocity of approach (before collision)")`
` = ((v_2 - v_1))/((u_1 - u_2))`


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