question_answer

    A mass of 10 kg is at a point A on the table. It is moved to a point B. If the line joining A and B is horizontal, what is the work done on the object by the gravitational force? Explain your answer.   

Answer:

   The work done on the object by the gravitational force is zero. Since, the motion of object is in the horizontal direction whereas the gravitational force i.e., acting vertically downwards is at right angles to the direction of motion of object.