Q3. A worker needs to lift boxes that contain small spare parts for a sewing machine from a flat conveyor and place each box onto a roller cart (as illustrated in Figure 1), 4 times per minute over an 8-hour shift. However, the weight of each box is 13 kg, and lifting each box requires a high level of caution, since the boxes are not have handles. Also, the worker needs to twist her torso about 45 to put each box onto the roller cart. You need to (a) determine the recommended weight limit (RWL) and Is the worker at risk of MSD? and (b) provide your recommendation and solutions. Figure 1: The worker lifts the box from the conveyor to the roller cart 13kg 105.4 cm 27.9 cm 33 cm 45.7 cm