Which statement is correct?

A. Light, in a vacuum, travels at the same speed even if the light source is moving.
B. Light given off from a moving source will travel faster in a vacuum.
C. Light given off from a moving source will travel faster in air.
D. Light, in a vacuum, travels slower if the light source is moving.

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