why the answer is A and D?why not B?9,如右图所示,小球在竖直力F作用下将竖直弹簧压缩,若将力F撤去,小球将向上弹起并离开弹簧,直到速度变为零为止,在小球上升的过程中 ( )A. 小球的动能先增大后减

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/16 00:18:28
why the answer is A and D?why not B?9,如右图所示,小球在竖直力F作用下将竖直弹簧压缩,若将力F撤去,小球将向上弹起并离开弹簧,直到速度变为零为止,在小球上升的过程中 ( )A. 小球的动能先增大后减
xSnPl% dAQ#m#B;6v*i SUNRc^kc[uc3sΙ93˹dwl*;{e)nL>)l=pӺPcw̹yͺl kit:fCLM?Iq ^Hߺ`NO@7XSE`%΢ 9}Q.>ߓP]pptCex>y@3D1 >AUGp=MP-^O IhfBf5Z50U>lP/>Ǡh57+҈j]5KoE9[R픶M~LbK=p`/;f)jvBK.fi~GKDխn຃6%Zc]:8ӿa

why the answer is A and D?why not B?9,如右图所示,小球在竖直力F作用下将竖直弹簧压缩,若将力F撤去,小球将向上弹起并离开弹簧,直到速度变为零为止,在小球上升的过程中 ( )A. 小球的动能先增大后减
why the answer is A and D?why not B?
9,如右图所示,小球在竖直力F作用下将竖直弹簧压缩,若将力F撤去,小球将向上弹起并离开弹簧,直到速度变为零为止,在小球上升的过程中 ( )
A. 小球的动能先增大后减小
B.小球在离开弹簧时动能最大
c.小球的动能最大时弹性势能为零
D.小球的动能减为零时,重力势能最大
答案是AD

why the answer is A and D?why not B?9,如右图所示,小球在竖直力F作用下将竖直弹簧压缩,若将力F撤去,小球将向上弹起并离开弹簧,直到速度变为零为止,在小球上升的过程中 ( )A. 小球的动能先增大后减
我明白了.
在弹簧恢复原长过程中,弹簧受到阻力源于小球重力,故在恢复原长过程中,弹簧与小球间始终有力的作用.
最开始,弹簧弹力大于小球重力,小球做加速运动.
后来,在一时刻,弹簧弹力与小球重力相等.
之后,弹簧弹力小于小球重力,小球做减速运动,而此时弹性势能不为0.
故无BC

小球离开弹簧 肯定是先加速运动 再减速运动啊 离开弹簧时速度不是最大

Why the answer is The answer is a pig The answer is a number Help yourself ____ the fish.a.tob.atc.withd.to eatwhich is best answer?why?thanks a lot. ___ you have eaten the box of chocolates,you will know the taste of life.A.when B.Before C.UntilChoose the right answer.Why?The answer is A .I don't know why Travelling by air may be _______ A.quicker B.more quicklyWhich is the right answer? And why? I've made some coffe.would you like __?A some B anywhich is the best answer?and why? why is this the relative atomic mass of chlorine not a whole numberplease answer it in english A third of parents have said they are unsure whether the education standards hace been adopted ___they live.A why B when C where D until the answer is C the answer is C,translate it ,thanks RIDDLE 1.What coat is put on only when it is wet?Answer:A coat of ______.2.Why is the letter T like an island?Answer:Because it is in the _____ of water.3.Why is your nose not twelve inches long?Answer:Because then it would be a _____.4.What three le 英语谜语1.What coat is put on only when it is wet?Answer:A coat of ______.2.Why is the letter T like an island?Answer:Because it is in the _____ of water.3.Why is your nose not twelve inches long?Answer:Because then it would be a _____.4.What thr It is hard to answer the question___ dictionary is the most useful.(that,why what they need at present ____(be)science and technology?why the answer is aresorry the answer is IS.Who can tell me why? who can tell me why the right answer is who can tell me what is the right answer?thanks!10.Tom is taller than ____ in his class.A.any girl B.any studentC.any other girl D.any studentswho can tell me why the answer is thanks so much! Do you know the man ______under the apple tree?a laying b lying c lay d lainthe answer is b,but why.and how to translate in chineseor the answer is wrong? Which word is the longest word in the world?And why?The answer is______________________Because_______________________________________________________________ The difference between store and shop.I am unsatisfied.why you want the answer-bcz i don't know where iam working is a store or a shop. Who can tell me the answer And why?5.Is this factory _____ a lot of students visited yesterday?A.the one B.that C.which D./