1. The pair of pulleys shown in Fig. 1 is used to lift a 80 kg block 0.25 m. The constant acceleration of the block during the lift is , and the pulleys and rope have negligible inertia and negligible friction. What is the tension
申論題內容
(h) Draw energy diagrams for three systems during the lifting: block;
block and Earth; block, Earth, pulleys, rope, and person (40 %).