[领域] 力学 [来源] 参考书 (课本习题、考古题、参考书...) [题目] A heavy chain,mass m,is propelled in straight horizontal line by an engine delivering a constant power P.If the veichle starts from rest, show that the distance traveled in a time t is s=根号(8pt^3/9m) [瓶颈] 书上写说这题是"变力" 我的问题只在於 怎麽知道他是变力 从题目哪里可以判断出他是变力? 知道後我就会做了 感谢大家@@ --

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