400J Total work done in lifting and moving the luggage is 588 Joules._x000D_ Explanation :_x000D_ 1. work done in lifting the luggage_x000D_ = potential energy of the luggage_x000D_ = mgh_x000D_ where,_x000D_ m = mass = 20 kg_x000D_ g = acceleration due to gravity = 9.8 m/s²_x000D_ h = height = 3 m_x000D_ Hence,_x000D_ P = mgh = 20 x 9.8 x 3_x000D_ = 588 J_x000D_ 2. work done in moving the object,_x000D_ Since now weight of the luggage is acting in downward direction and the movement is in horizontal direction, hence work done in moving the luggage is zero because component of force along horizontal direction is zero._x000D_ Total work done = 588 + 0 = 588 J._x000D_ Hence total work done in lifting and moving the luggage 588 J.

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