Question

光滑水平面上有质量为m的A和B两个物体,B上装有一轻质弹簧,B原来静止

光滑水平面上有质量为m的A和B两个物体,B上装有一轻质弹簧,B原来静止，A以速度v正对着B滑行，当弹簧压缩到最时，B物体的速度是多少？此时弹簧弹性势能为多少？

Answer 1

用动量守恒和能量守恒定律解题。
当弹簧压缩到最短时，A、B速度相等mv=2mv'，v'=v/2
此时，弹性势能等于A、B系统动能的减少量
后面表达式不会输入，就不写了，不好意思！

Answer 2

Wade James punched the locker room exposure

Watched the Mavericks won their country's first championship trophy, the overwhelming criticism relentlessly pound the Heat, but was driven to distraction in the final performance, James is without a doubt the guy standing on the cusp, and after losing his Wade has also been put into a conflict table. Two days ago, ESPN names are written in a burst after the sport is, within the locker room, James Wade straight to the punch.

But ironically, "Miami Herald" published a full-page advertisement yesterday to celebrate heat won the Season championship, James is without a doubt inside a handful of salt rubbed the wound. The facial skin of a number of media and fans blamed the small emperor responded fiercely: "Let them laugh go to see how lengthy they are able to pleased! they are available returning to reality ultimately. I'm searching to fail the individuals who usually Get up one day, their individual issues won't change because of my failure, I'll continue my life. "Finals Game two from your Miami Heat was reversed calf started, there was clearly an odd phenomenon, as long as Wade on the court, James could be customary "misfiring" in between the 2 with nearly no attack. Within the finals following the conclusion of Game three, James Wade as well as publicly criticized,five finger, though within the postgame news conference, James "humble"to acknowledge Wade criticized reasonable, but clearly their relationship after A subtle change,fivefingers vibram, they are not harmonized.

ESPN columnist Broken Sad day before yesterday in their own individual micro-Bo broke this news the contradiction in between James and Wade had come to the aim of irreconcilable,five fingers, Game 6 from the finals after the 2 started in the locker room Quarrel,five fingers shoes, James Wade right to the punch. Heat the interior strife began. "While Broken Sad immediately be explained, stating that there's a great thing for fans pretending to be their very own micro-blog of the hair, he did not know, but you will find indications that the conflict in between James and Wade are not groundless.

Answer 3

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