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, 1 s km t h s km t h = = = = 4B , –jA $ –jB4=4Hj <B0–'%g0– 1 $ h ^ 4BeJ0P0Z0 , , , 2 ,)O . 5 , $ s v km h t = = = eJ0P04 ,%% t–$%% — - t 1%% —–,$%%   !"#$%%&$%%' ( ) $ $ $ - , . , 1 s v km h t = = =  $ ˜ , eJ04=4HB <B™‹=0Z0==b*4'%g0 A A , , , , 1 ,)B $,O 5 $ s v s v t km t = ⇒ = = = ™‹=04==b*4'%g0 A A $ $ $ $ 1 ,B $2O 5 $ s v s v t km t = ⇒ = = = eJ*4'%g044"@0R‹ B A $ , $2 $, -O 5s s s km= − = − = Câu 4B c"00 , $ , $ )% . -% . $ j tb v km h v km h t t t v = = = = = ^ 4c , , , , , , , $ $ $ $ $ $ $ $ $ tb tb s t v s v t v t s t v s v t v t s v s v t t = ⇒ = = = ⇒ = = = ⇒ = O$5 L , $ s s s= + O)5 /O,5AO$5AO15O)504=b , $ , $ $ $ )% -% d%O . 5 $ $ $ $ tb tb v t v t v t v v v km h = + = + = + = 2 O,5 O15   !"#$%%&$%%' LS{…Xš L=@ @3 K/0 ? eJ3m >  M  M  M  M K, %Ad , , %Ad %Ad , , %Ad , $ K$ , $ , $ K1 , %Ad , , , %Ad , , K) , $ , $ Kd , %Ad , %Ad $ , K- , %Ad , %Ad $ , > 1 ,Ad %Ad , 1 ,Ad ,Ad 1 $ 1 - 1 ) 2  . 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