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

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
Bears a constant ratio to their velocity of approach

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

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