k = 100 Nim x=-.5rn x=0.0m x=0.5m A block of mass 1 tl kg on a horizontal surface 1s attached to a horizontal spring of negl1g1ble mass and spring constant [DU N," m. The othei end of the spring is attached to a wall. and the1e 1s negligible iction between the block and the horizontal surface. When the spring is unstretched; the block 1s located at :1 t] 111. The block 1s then pulled to .1' - 0.5 m and released 'om rest so that the block-spring system oscillates between: --= D.5 m and :r. : {15 In: as shown in the figure. Which of the following descriptions about the system are correct? Select two answers. The kinetic energy of the block and the spring potential energy of the system at .1 _ H.251 III are both (A) half of the total mechanical energy of the system. (B) The spring potential energy of the system at .r _ [L25 m is nearly 3,13 J. v\" (C) The kinetic energy: of the system at 1*- 4-113 no is nearly-4's r .l'. The sum of the spring potential energy of the system and the kinetic energyr of the block at :1 t}. -'l 111 J- (D} , 1s 1193.11} 12. a J