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Work, Energy and Power
Question
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What happens to the centre of mass, if the external forces acting on a system have zero resultant? 

Answer

When the external force acting on a system have 0 resultant, the centre of mass will move with a constant velocity. That is, the centre of mass, will not accelerate. 

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Some More Questions From Work, Energy and Power Chapter

What is the relation between kWh and Joule?

Does the body at rest possess energy?

By eating two apples, a person starts pushing the wall of room. If food value of apple is 100 calories per apple, how much work he will do in pushing the wall in one hour?

A man is rowing upstream and is at rest w.r.t. shore. Is he doing work w.r.t. shore?

Is frictional force conservative?

What is the work done by gravitational force in taking the mass m with constant velocity through height h?

A mass is tied with a string and whirled in horizontal circle. What is the work done by tension force?

Does the work done by force depend upon the velocity at that instant?

What is the work done by man against gravity when he is carrying a load on his head and walking on the horizontal road?