Câu 1: !"#$%& ' () * + ,-. /0 #123 4 5 1 6 7 8' /0 #123 & 4 23' 9:4 ;2 , ' Câu 2: ( !26 $:- 8 ,%< 68=#3,;2' >? @# 2< A + B )' 9:4 g=10m/s 2 ' () C+ 8*#. /DE*C1$ :' /DE*C1F )' Câu 1.(GH ! /IJ /I K J LA DEM#3M##4N6"#' OP+ Q;2/ /R+ 6 1. mv= 0 # 18+ . vv −= , R+ 2 # 1. mvmvp −== ,, R*+ . mvmvmvppp , , −=−−=−=∆ S,''S,Q';2/ /0 # 1&423 , ⇒ , R*+ . I K , T SS'SQ';2/ Câu 2.(GH ! ,, ,;2 /*C1$:'UJ /*C1F)'UKJ Câu 3:V#A=#W , #4N 6 8X;26 16 @#A=#>G , X #4N 6 8 ;27M#6@#A=#W 7 Y B 2Y' (Z 8 Y@#A=#2 # 1'D *2 1[ @#A =#3333\' LA /DE*C1$:' DC+ 8 UU ]U , , mv ] /Q^!'',,',' , , J=+ /DE*C1F)' DC+ 8. UKU ]U , _ , mv ] , ,',' , ]^Q`/ Câu 3.(GH , X;2 , X , ;2 J_ v J_ , v LA ab\,@#A=#W3>' DEM#M##4N =#+ @#A=#W' LE , .38+ @#A=#6 1 3 , v v ′ ′ .38+ @#A=#2 # 1' OZ?@# 2Y3YcbQE3A /M#& #+ bA3. Câu 4: 1 ! 4 6 8 B d , ;26P"#43 :e'f -. /O1#2P#^ 3:e343&4 G' fY F A #Z+ e' /g*#:eh34 ,' fY F 8 + 1G 4 ?:e' , , p p p p ′ ′ + = + r r r r Qi/. *#Qi/M#. , , , , , , p p p p m v m v m v m v ′ ′ ′ ′ ⇒ + = + ⇔ + = + , , , ,'X X' ,' X' X X v v v v ′ ′ ′ ′ ⇔ + = + ⇒ = − Q/ O 1333\C+ bA 3. , _ ,, , _ , ,, , , , , , vmvmvmvm +=+ , _ , _ , , _ , , _ ,, X , jX' , ',' , 'X' , X',' , vvvv −=⇒+=+ Q,/ LA b Q/ 3 Q,/ 1 b B 7 . , k ; l ,k ;v m s v m s ′ ′ ⇒ = = Câu 4.(GH !!' SX ,;2 2^^' S, /m J /J LA /ncFo*C , , ' , , C mv mv A F s− = = − (GF c 3A#Zs3"#42P#+ 13 e' p1&eZ 9A#Z+ e' , X , , !' ', ,!' , ,'^' C mv F N s − − ⇒ = = = ' /ps’ = 2cmA+ eF C "qBdG 8+ 1G 4 ?:e3. ( ) , , , , ^ ; , ^ C mv s v F s v m s m s ′ ′ = − = − = − ≈ ÷ '