vDt ? ¨ i d?? p d?? p 2-1 é sY 1 m A =100kg m B =60kg¥ AaB t8¨ 7 ?¤F?B"d ? ?m 2-1b ?? ? %? £ ü1 ?  | ?¥ `?sY1 α =30 0 β =60 0 b ?t8D| ?Wí ? á }? 7¥é - {?9 ù 1"d|_ 'H?$ 2"d¥F ?v$ 3 7?¥f ?v$ 3 (1) a(2) L ! A/á ? ? ? ? ? = =°? =?° BA BBB AAA TT amgmT amTgm 30cos 60cos ¤ 2 m/s12.0 30cos60cos ?= + °?° = BA BA mm gmgm a "d|_·H?b (3) N502)12.060cos8.9(10060cos =+°××=?°= amgmT AA 2-2;á £ ü ? %? B???1 R¥?ìB?é 1 m¥l o A[ ? v 0 L?ì =CT??? ?m 2-2 ? Ul oDìC¥? ?" ?1 μ  pl o ?B H Y¥ ? qb 3 !?ì =Cól o¥_? ?1 5 n F E_ R v mmaF nn 2 ==  M_ mF n =?μ t v R v d d 2 =?∴ μ  ∫∫ ?= t Rv v v v d d 0 2 μ  v v 1 μ + = 2-3 ?m 2-3 ? U X? m 1 >m 2  ?9á }? 70é  ??t8¥F ?  2m 2-3 c1Bè0F ?  6¥ f? p 70¥f ??t8M?è0¥F ?b 3 (1) (a) ¤ ? ? ? ? ? == =? =? TTT amgmT amTgm 21 222 111 g mm mm a 21 21 + ? =  g mm mm agmT 21 21 2 2 )( + =+= (b) ¤ ? ? ? == =? gmFT amgmT 1 22 g m mm a 2 21 ? = (2) !t8M?è0¥F ?vl1 a′5 ¤ )( 21 21 ag mm mm a + + ? =′ )( 2 aagmT =+′+= 2-4Bt81 1 oV ?[ ? q v 0 ?°  ?bL? b t8E ?¥ ?′1 k1è ?b p 1?t8 ?  6¥ú  2t8Rí1 ? H ?¥vlb m 2-1 α β A B t v d d t R v 0 0 ?9 ?b ? ? ? ? ? == ? ? TT gmT Tgm 21 22 11 ( 2 21 21 g mm mm + m 1 (a) 5 p  1m 2-3 +′= ?′= T aam aam 2 1 )( )( )a+ F r =kmv m 2 (b) gmF v v 1 = m 2-3  a? b 2  ? m1t8¥é  m 2-2 m 2 m 1 A a v ? 70¥f m 2 (c) vDt ? ¨ i d?? p 3 (1) [1 ?1e? ?°_ 1 à?_? d? p y y v mv t v mkmvmg d d d d 2 ==??  ∫∫ + ?= v v y kvg vv y 0 2 0 d d  2 2 0 ln 2 1 kvg kvg k y + + = t8?Kú? H ¤ 0=v g kvg k y 2 0 max ln 2 1 + = (2) / ? H y v mvkmvmg d d 2 =+?  ∫∫ ? ?= vy y kvg vv y 0 2 d d max  g kvg k yy 2 max ln 2 1 ? =?  k eg v yyk )1( )(2 max ? ? =  t8?K1 ? H 0=y ¤ 2 1 2 0 00 1 ? = ? ? ? ? ? ? ? ? += g kv vv y 2-5 B9é 1 l¥ yH b;ᥠ ?   ?B /< /<é 1  ?m ? UbL? 7 S H yH á? p yHDá ?H H¥ ?b a 3 ! yHé 1 é L á1m l m =λ /<é1 H ?1 ? d? p y v y v mv t v myg d d d d ==λ   ∫∫ = vy a vvmyyg 0 ddλ m 2-5 l ayg m ayg v )()( 2222 ? = ? = λ ? H yHá ?Hly = l alg v ly )( 22 ? = = 63 ¨? ? o?? ? | ?1× ? ] ?¥ ,?5 222 2 1 ) 2 1 ( 2 1 lvglga λλλ =???  l alg v ly )( 22 ? = = 8? ? 2-6 5 2-3 2? k [F ??¥è01? I" ?¨8? ?¥ZE p 70¥f ??t8M?è0 ¥F ?b 3  ¤ ? ? ? ? ? == ′=?? ′=?+ TTT amamgmT amTamgm 21 2222 1111 )( )( )( 21 21 ag mm mm a + + ? =′ )( 2 )( 21 21 2 ag mm mm aagmT + + =+′+= 2-7 ?m 2-7 ? U ??? ?[F ? a v  £ ü ?_·? H;á| ? ¥é 1 m ¥t8  ?á?  ? pt8| ?¥a ?b a v θ m 3 [ ??? ?1? I" (d8?" ) M ?¥F ?m 0=′a ? ? ? =? =? 0cos 0sin mgN maN θ θ ¤ 22 gamN += m 2-7 6