A 78kg man is carrying two bags (W.) each weighing 30kg while ascending a staircase as shown in the figure below. Assume that the geometric parameters and the weight of the leg are measured in terms of the person's height h and total weight W as follows: a=0.05h = |OA|; b= 0.20h = |AB|; c = 0.52h = %3D |AC}; a = 45 (angle |OA| makes with the horizontal); = 80 (angle |AB| makes with the horizontal); e = 70 , W1 = 0.17W. Calculate the magnitude and sense of the muscle force and joint reaction force. Some useful equations: FMy= FM cose and FMx= FM sine FJy FMy FM: W. Wo Figure 2: A man carrying loads. Figure 3: Forces acting on the lower leg in a one leg stance.