Applied Mechanics and Graphic Statics
‘u₁’ and ‘u₂’ are the velocities of approach of two moving bodies in the same direction and their corresponding velocities of separation are ‘v₁’ and ‘v₂’. As per Newton's law of collision of elastic bodies, the coefficient of restitution (e) is given by

e = u₂ - u₁/v₁ - v₂
e = v₁ - v₂/u₂ - u₁
e = v₂ - v₁/u₁ - u₂
e = v₁ - v₂/u₂ + u₁

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Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Proportional to the square of the distance from the point of reference
Inversely proportion to the distance from the point of reference
Proportional to the distance from the point of reference and directed towards it
Always directed away from the centre, the point of reference

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