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2、5Nt=0.4s 5vF1vFabvbcO0.232 10 kg A. bc B. ab20s C. 60kW D. 12m/s 6.qRCDC OPQCDOQ A. PQ B. O C. P D. PQ 7. 3 / 8 A.B. C.D.8. dt=0mv00T/3Tg0T A. 02v B. C. D. mgd 9.ABCDBABCDLRmLMNMNMNMNv0MNACRQ 4 / 8 A. B. C. D. ABR10.R1R2kR2( ) A. 2R2k R2R12 B. 2R2k R22R21 C. 3k R2R1 D. k R2R1 2 16 5 / 8 12.S110AE=1.
3、5Vr BGIg=1mARg CR1 DR2R3 ER4 F1(1)SR2RR =110 (2)SR2R3R2=R3=R4R4 44 13.8 50kgm08.5m/sv 6 / 8 211.5m/sa227m/sa0.75m1F2s3 14.10RABBPQPCQAC80%CB3RPmg1ABBh2P3E 7 / 8 15. 12 xOyyRxmqyyRPv0yxxRQ1E2B 8 / 8 16.14PmABABPLABB121tan 2APAB (1)ABAa1 (2)APBl0 (3)BlB 2019级科学 RRrRIE12gg RRRRr150012g I150A0.01A1.5 II
4、RIRRggg15031 RRRRrRRR1503g123g1 R14.52I150mA5.4mA0.6150 12003 R6 101001501.534 Fma350N2 v1aavvv12101 v7m/s1 atv1s21 svv tvtx2211011 x0.75ms12m tvsx25.625m/s hR2.5mg514EmgR3Rm g mvQQA=2 vgRA Rhgt22112 Rv tA31 hR2.5 hgt2122 Rv tB32 vgRB59 RFm gmvNPPB2 FFmgNN514 m g Rm vm vQQAQ Q2221122 vgRQ5 mvm vBQ Q vEmvmBQ Q280%12122 EmgR3 =qREmv4302=qRBmv250=vtR5202 2183 mqE 43