第一章 功和功率（练案二）-2020年高中同步教与学物理（鲁科版必修2）

书书书 !"# ! $%$& ! ! " ! # ! $ ! % " !"# ! ! $%&'() !! !"#$%& ! '()*+,-$. " !! # "# /0123#4 ! )512$6789: $# /0123#; ! )512$</89= %# /012>3# ! )51289?67 &# #$:=.@/$:=A12B/$CDE$67$:= -9$ '! :=FG$HIJ/KLMN"OPQR $ STKLU " ! A " ' $12 # $ $ E ! V # WXYHIZ[\]67 % ! V $ W ^_HIZ[\]`a$67 ! bJ/ & 0 # $ $ 3$# ' ! A ' ' Fcd " !! # "#' ! # ' ' $#' ! $ ' ' %#' ! (' ' &# ?*cd )! e8fNHIg/ & MNB12E ! V12BXYHIZE 7\hi % ! & 3#U ' ! % ejfN`a:=$/ & WkZC DMN"12E ! V12W^_kZ7\$hil. % ! & 3# U ' ' ! mn " !! # "#' ! (' ' $#' ! # ' ' %#' ! $ ' ' &# ?*op ' ! A ' ' $!q *! !"rs/$# ! '()*,-$. " !! # "# Qrs/t.3,# ! Y\rs/t.3u# $# Qrs/012>893# ! Y\rs/012893# %# Qrs/012893# ! Y\rs/012vw>3# &# Qrs/AY\rs/xvw012>3# " !"# " ! $%&'*+ +! N +,- $/J8ySTU !,. / $12BHIzZE{| ! }~�� ! �12{|] !,0 ! J/ & 3$# ' ! ( ! �/ ( 3$# ' ' ( ! }�12�HIZ�\rs� � ! (,!! ! 12���/3# ' ) ( ! " 123)45(,#6 ! 781)45(,#9 ! / (!,0 & 1 ' # 6! ���� !0 & 1 ' $����STU !,,,. / $�1@QR� ��zDE�� ! � ) � !,0 & 1 ' ! bB !1 ����0�1� 3$#. " !! # "#+,,: $#*+,,: %#+,,,: &#++,,: 4! N/ & VSTU !,. / $12�QR�� ! � '0 & 1 ' $�� ����E� ! >����/ ! ) � !,0 & 1 ' ! mn '1 � & 3 # " !! # "#9,: $#',,: %#*,,: &#*9,: " ,-# ! ! .&'/0123 9! KL��~ +g9¡/ & 0=¢�3$# ' ! A~£+g 9J/ & 0=¢�3$# ' ' ! ¤cd¥¦$:= ! ;! ���� *(!0 & 1 ' $��� ! �� ((!, * - $�1@QR ���DE�� ! mn ! B !1 ����0�13$#. " � ) (!,0 & 1 ' # " !! # "#+,,: $#+,,,: %#*+,,: &#++,,: !,# W§�>`^_¨�F`$kZDEJ©ªF`$12 ! } �E�$«�F` ! '()*,-$. " !! # "# W§�=$kZJ/3$#=¬ $# W­kZ[\®���/3$#8a: %# W§�=$kZ[\®��rs/3$#:¬ &# �[\¯°>±² ! ³W­kZ[\®J/3#$:=? *cd !!! ´BXYHIZE$QR12 ! BHIJ/ & ! MN' ! 7\h i % 3# '! }J/µU & ' ! �HICD�¶·U ),5 ! V12 7\hi '% ®3#l. ' ! b & ! A & ' $:=¸cU " !! # 槡"#'<! $#'<! 槡%#)<! &#)<! ' ! ' !" !!! #$ !!!!!!!!!!!!!!!!!!!!!!!!! %&'()*+ ! ,- " . # " ,-# " ! -4154'& !'! }~�� ! 12B¹yº»/ & ! $ & ' MN'@QRWHIZ 7\ '0 ! bB'(¼½+/0123#¾4$. " !! # "#& ! (9- ! & ' (, $#& ! (9- ! & ' (9- ! " (!',5 %#& ! (6- ! & ' (9- ! " (;,5 &#& ! (6- ! & ' (6- ! " (6,5 !)! �¿�� + , ÀÁDEÂ�8ySTU " $=à ! E�$¾: «�. ,! }����/ - $:=g9 ! b�Â�ÄÅÆ�Ç »$È