please show work.

Position B Position A m =4.0 kg k = 500 N/m 30 cm 20 cm 4. A person holds a 4.0 kg block at a position A shown above on the left, in constant with an uncompressed vertical spring with a spring constant of 500 N/m. The person gently lowers the block from rest at position A to rest at position B. Which of the following describes the change in the energy of the block-spring-Earth system as a result of the block being lowered? a. The energy decreases by approximately 1.5 J. b. The energy decreases by approximately 2.5 J. c. The energy increases by approximately 4.0 J. d. The energy of the system does not change. OD 2 m 1.2 m B 5. A 0. 2 kg object slides along a curved wire, starting from rest at point A, a height of 2 m above the lowest point, B. It continues to slide to point C, a height of 1.2 m above the lowest point, B. The path is frictionless. The speed of the object at point C is most nearly a. 7 m/s b. 6 m/s c. 5m/s d. 4m/s