Applied Mechanics and Graphic Statics
The phenomenon of collision of two elastic bodies takes place because bodies

Attempt to regain its original shape due to their elasticities
Tend to compress each other till they are compressed maximum possible
Immediately after collision come momentarily to rest
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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

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

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Applied Mechanics and Graphic Statics
A body is said to move with Simple Harmonic Motion if its acceleration, is

Proportional to the square of the distance from the point of reference
Inversely proportion to the distance from the point of reference
Always directed away from the centre, the point of reference
Proportional to the distance from the point of reference and directed towards it

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