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

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

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Applied Mechanics and Graphic Statics
Newton's law of Collision of elastic bodies states that when two moving bodies collide each other, their velocity of separation

Bears a constant ratio to their velocity of approach
Is equal to the sum of their velocities of approach
Is inversely proportional to their velocity of approach
Is directly proportional to their velocity of approach

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