如图所示，搬运工人用滑轮组提升重540N的物体，所用拉力F为200N，物体以0.2m/s的速度匀速上升了10秒，（不计绳重，绳与滑轮的摩擦）求：

果农想尽快改良果园里桃树的品质最适合的做法是

阅读理解
(Mr. Zhang is showing Wei Fang and Li Lei a modern factory.)
Mr. Zhang: You can’t see many workers here, but you can see a lot of robots. Look, that robot has two big hands.
Wei Fang: How strong it looks!
Mr. Zhang: Yes. It does much work for us.
Li Lei: There are so many big boxes here. What are the robots doing?
Mr. Zhang: They are making fridges.
Wei Fang: How fast they are working!
Li Lei: How much time do they need to make a fridge, Mr. Zhang?
Mr. Zhang: About five minutes.
Wei Fang and Li Lei: Only five minutes! What a modern factory it is!

地球表面陆地面积占地球总面积的（    ）