Have you ever heard of Jinjiang Hotel? It is on our busiest street. It's the best place to live in if you travel here. The hotel is only 0.5 kilometer from the biggest supermarket and the subway.

    It has three kinds of rooms for different people to use. The first kind is standard room, that is two beds with a bathroom. It offers you the air conditioner, the television and the telephone. Second is the single room, that has only one bed. Though it has only one bed, you can enjoy yourself, for the bed is really comfortable and the environment is really good. The last one we call commercial room. That is served for businessmen. The commercial room has the best quality. It also provides 24-hour hot water. You can have free tea in the afternoon. Imagine how nice as you drink tea as talking about your business with your partners. If you want to eat something, please just call 123, the food will arrive in ten minutes.

    One great thing is that it is very safe here because we have a few strong guards working day and night, so I'm sure you will have a great time living here.

图中，一段弹簧固定在水平桌面上（如图甲所示），将一个小球放在弹簧上使其处于静止状态（如图乙所示），用竖直向下的力F压小球至图4丙的位置，然后撤去力F，小球向上运动A点后下落（如图丁所示），不计空气阻力的影响．则从撤去力F到小球运动到A点的过程中，下列说法中正确的是（　　）