As a woman carries her suitcase up a flight of stairs, she does work against gravity. If the mass of her suitcase is 10 kg and the flight of stairs is 12 m tall,
how much work does she perform by carrying her suitcase? (Recall that g =
9.8 m/s?)

Diego is trying to lift a piano to the second floor of his house. diego uses a pulley system and gives a big lift to the piano. the piano moves upward, then stops, and then it starts to fall to the ground. which list best describes the forces on the piano in the proper order? a. positive force, balanced force, negative force b. negative force, balanced force, positive force c. positive force, unbalanced force, negative force d. negative force, unbalanced force, positive force