In one of the Earthmover's operations, a motor driven screw jack is employed to lift a platform, the load being 30kN. The screw jack has an effort of effective radius 400 mm and a single-start square thread, having a lead of 7 mm. There is a problem with supply of this screw jack, and so an alternative is used. It has a effort but with an effective radius of 350mm and a single-start square thread, having a lead of 5mm. Initially an effort of JE1 newtons is required to raise the platform using the first screw jack. With the second screw jack, an effort of 500 N is required. Showing your efficiency calculations , make recommendations on the continued use of the second screw jack. Where, JE1= 525 Newtons