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

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Applied Mechanics and Graphic Statics
Periodic time of body moving with simple harmonic motion, is

Directly proportional to the square of its angular velocity
Inversely proportional to its angular velocity
Inversely proportional to the square of its angular velocity
Directly proportional to its angular velocity

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