4.5 机械能守恒定律(同步讲义)-【创新方案·高中同步创新课堂】2020-2021学年高中物理必修2（教科版）

5!DE&$!%ÞØÙ³(â�«Ì@�M6,(/b)�/°dD(dD5 }+/078(23ª@dÃyÉÀÁ'MÕÖ' $"%ÑÿØô_,!-@dDM+, 0!. $"!+5>"!%+%"!+," +!" .!-.+!""2.!-' $#%«¬Ò2ÞtMô¬(n_£s(ðs;ò& $$%Sn K .56!+(!M3.A!+(�RA. !M3 K 56. $!"$;"!++ $!%+;"!!$ " +!+!8*!2?&+!+*#?' FG&$!%b¢£Y,%&!$"%+!""2!$#%�;�A!$$%+!+*# !%"!DBlCþ·¸ !"#$!()*+""""""""""""""""! !,-./" '#!!$!%�ý!��!$"%�ý!��!��!�ý!$#%÷øël !&l!X0ël!"!ël!&l!&l!ël -#!!$"%æ ê ! æ ê ! $#%& l ! ë l ! � + !"!$"%567! ! ! " 50!"!567"! ! " 50""! ! " 50""! ! " 50!"! ! " 50!"! ! " 50"" #!$!%X0!÷0!&l!ël!BDE#!mn�+!$"%MH"* M3"!M" !3456" $!%#!$"%"!$#%#!$$%"!$%%" !0123" !!45&ãäa/@(3'5g�(3'Ãe�d(�8e�9'/+ øc(3'5M�ø((8e4øc(N+,øc' "!45&å'�ÿB�t(¿ÞÃe�H\åM8e)å15B�t( 8e)3'Ãe�H)a/B�t(3'Ãe÷)8e�H' #!45&!"#'Ø�eIhæ¢�«¬æ¢?ã·¸u¼'=2 35}+/078@(!"#$R3'¯¿'5�(Ø�e!"# æ¢'ð23-3'>×'M£¤a}+)178(EØ�eI �9M' !"#%!6748""""""""""""""""! 9:" !;<=>" A ()!ñst3'>¿'5�(23 # >¿Ä�»M`ßØ�e æ¢(b23 # Ø�e!æ¢(' O'øst23 % y[3'j( ¥[¿'(¿'P % 5c�(Ø�e!æ¢(b�eK­_5 ##% �»M`ßØ�eæ¢(&O'lst0Ö4'P # 5c�(P % 5g�(óô>\](##% Ø�eæ¢(( P'çst8e!G(à e!G(Ø�eæ¢()P' !?@AB" !!A &(!Ø�eæ¢M?ã&$R`ß�M3'¯`ß�M¿'5 �(̀ ßY<[j'£¤(bj'!5�(Pn¿'5�("#%è ÈÚ¿ÞÃe>8e{3'Ãe9èM�H'R0M×'P23 5�(;<Ø�e!æ¢(' Oi'`/1HM23($[3'£ ¤(Ø�eæ¢(&gh'23y[3'£¤j¥[X[ÉÊ'£ ¤(bÉÊ'!5�(Ø�eæ¢(( gh'23[m{() M × '(Ø�e!æ¢()Oi' "!A '(!6vB�(PnÊ;>/1�»M`ß($R3'5�(Ø �eæ¢((P() O)1-`/wx@(Ê; M + , ë c(L 1 - �m{wx��`/wxMB�t # ;MÃe�9(8e�9(% ;MÃe�©(8e�9(' P(&O' 9:C !;<=>" DE&$!%́ ;S # �% MB�t$R3'5�(LØ�eæ¢' «¬Ø�eæ¢#Xã 56$!;-01#+,%E. ! " 50%"(�0% . "6E$!;-01#+,槡 %. 6槡E. !+8!!槡 5.!-.$.!-' $"%!´;/ß_\ÒstM & _(�´;S % � & B�t$R3 '5�(Ø�eæ¢'«¬Ø�eæ¢#Xã ! " 50&", ! " 50%".56$O,E% �0&. 0%"*"6$O,E槡 % . $"*"8!+8$%!2;!!5槡 %.!-.!+.!-' FG&$!%$.*-!$"%!+.*- !?@AB" !!A (!!=2Ç78�6,7 @(¿M3'Ãe>8e"#:%( +�\0'2Ç15MB�t(«¬Ø�eæ¢#Xã& 567* ! " 50". ! " 50+" ÷ 567. ! " 50" ab³ã&0.槡" " 0+(LA (' "!DE&$!%%êd;e78�$ �(��$ iÿ�(àᯰ ! " 50+",56"">(N& 0+," 6槡>' $ $"%< #% ;-{[\]Ã[(�d;�$ $ �@M3'Ãe\ "56>(� % �$ ÔØ�eæ¢(�& ! " 50+"."56>* ! " 50$"( % d;-$ �[3'56 >?S`/()M£¤' ((«¬TUV W#X(ã& 56*(. 50$" > ( * S%*³ã (. 50+" > ,%56 ( ( éê(K(Nã³& :!=d;[�)aMä'@( (. ! " 56(0