What are the two necessary conditions to be satisfied to say that work is done?
1
Initially the body should be at rest and there should be an expenditure of energy.
2
There should be a force acting on the body and there should be a displacement in the direction of the force.
3
There should be a displacement for the body and there should be an expenditure of energy.
4
A force should act on the body and there should be an expenditure of energy.