1、 2018 1 14 1 2 3 5 4 300 kg 20 70 J 4.2 10 3J kg 5 6 V1 V2 0 15V 2 13 14 16 7 A B C D 8 9 5V S 3V A L1 3V B L2 3V C L2 2V D L1 5V 10 S A A B R1 R2 B A B R1 R2 C A B R1 R2 D A B R1 R2 11 L1 12 3V S 3V A L1 B L2 C L1 D L2 13 a b a m b m a c b c a b A b a m m b a c c B b a m m b a c c C b a c c b a m m
2、 D b a c c b a m m 14 A S1 S2 V B S1 S2 L1 L2 L3 C S1 S2 L1 D S1 S2 2 4 15 L1 L2 S L1 15 16 16 17 5 18 8 19 6 19 17 3min A B 18 1 3 1 2 19 1 a b c 2 20 8 21 9 17 20 h kg m 2 J (kg ) 1 J (m 2 h) 110 100 2.5 50 4.2 10 31.68 10 6 1h 1m 2 10h m 3 8.4 10 7 J m 3 21 72km h 10min 1.2kg F 1.2 10 3 N q 4.6 10 7 J kg 1 1 2
