Applied Mechanics and Graphic Statics
Parallelogram Law of Forces states, "if two forces acting simultaneously on a particle be represented in magnitude and direction by two adjacent sides of a parallelogram, their resultant may be represented in magnitude and direction by

Its longer side
The diagonal of the parallelogram which passes through the point of intersection of the forces
Its shorter side
The diagonal of the parallelogram which does not pass through the point of intersection of the forces

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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 directly proportional to their velocity of approach
Is inversely proportional to their velocity of approach

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