Applied Mechanics and Graphic Statics
Pick up the incorrect statement from the following. In a simple harmonic motion

Velocity is minimum at the end of the stroke
Velocity is maximum at its mean position
Acceleration is zero at the mean position
Acceleration is minimum at the end of the stroke

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

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