On a distant planet an astronaut picks up a rock of a mass 5kg. on this planet the weight of the rock is 40N. If the astronaut exerts an upward force of 46.2N on the rock, what is its acceleration

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? positive force → balanced force → negative force negative force → balanced force → positive force positive force → unbalanced force → negative force negative force → unbalanced force → positive force