There is an assembly line moving at 10cm/sec carrying an open box (as shown in the figure). A worker physically lifts another box (10 Kg) and places it in the box on the moving belt, and takes 4-5 seconds to complete the job. The open brown box is 20cm x 20cm x 20cm, and the 10Kg blue box fits snugly inside it and is made of ferrous metal. The assembly line is 50cm wide, 80 cm high and is over 10m long where it is loaded on one end with the open boxes. There is at least 80 cm space between each box, so the worker has enough time to do his/her task.
