Disk mass 2kg sliding on smooth surface velocit 5m/s when it strikes 4kg disk b sliding forward at 2m/s. direct cnetral impact Coefficient of restitution is 0.4. compute velocities after

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