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

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

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Applied Mechanics and Graphic Statics
The characteristic of a couple is:

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

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