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

Inversely proportion to the distance from the point of reference
Proportional to the square of 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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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
All listed here
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
The characteristic of a couple is:

Algebraic sum of forces, constituting a couple is zero
All listed here
Algebraic sum of moments of forces, constituting a couple, about any point, is same
A couple can be never the balanced by a single force

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