Applied Mechanics and Graphic Statics
Pick up the correct statement from the following. The kinetic energy of a body

Remain constant
Before impact is more than that after impact
Before impact is equal to that after impact
Before impact is less than that after impact

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Applied Mechanics and Graphic Statics
If a set of given forces are such that their free vectors build a closed polygon, then

The resultant force and resultant couple are always zero
The resultant force is zero but resultant couple is not zero
The resultant force and resultant couple both may not be zero
The resultant force is zero but resultant couple may not be zero

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