question_answer

                When do we say that work is done. Write an expression for the work done by a force when the applied force and the direction of displacement of the object are in the same direction.    

Answer:

   Work is said to be done, if force displaces a body. When the applied force and the direction of displacement of the object are in the same direction, work done will be, W=Fs and will be positive. So, work is done by the force.