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Question
If u₁ and u₂ are the velocities of two moving bodies in the same direction before impact and v₁ and v₂ are their velocities after impact, then coefficient of restitution is given by
Options:
A .   (v₁ - v₂)/(u₁ - u₂)
B .   (v₂ - v₁)/(u₁ - u₂)
C .   (u₁ - u₂)/(v₁ - v₂)
D .   (u₂ + u₁)/(v₂ + v₁)
Answer: Option B

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