question_answer

  Calculate the work done against the gravity.

Answer:

                  Suppose a body of mass m is lifted vertically upwards through a distance h. In this case, the force required to lift the body will be equal to weight of the body, mg (where m is mass and g is acceleration due to gravity). Now, Work done in lifting a body = Weight of body X Vertical distance W = mg x h = mgh Where W = Work done, and h = Height through which the body is lifted.