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1、Chapter2Exercises:2-6a)Attimet=0,thepositionofparticleis;Attimet=2.00s,thepositionofparticleis.Sotheaveragevelocityduringthistimeintervalis.b)Attimet=4.0s,thepositionofparticleis.Duringthetimeintervalt=0tot=4.00s,theaveragevelocityis.c)Duringthetimeintervalt=2.00stot=4.00s,theaveragevelocityis.2-7a
2、)Attimet=0,thepositionofcaris.Attimet=0,thepositionofcaris.Duringthetimeintervalt=0tot=10.0s,theaveragevelocityis.b)Thegeneralexpressionofvelocityis1,Attimet=0,thevelocityiszero.2,Attimet=5.0s,thevelocityisv=15m/s.3,Attimet=10.0s,thevelocityisv=12m/s.C）Whenthecarisrestagain,thevelocityofcariszero..
3、Sothetimeist1=0,t2=13.3s.2-10a)Attimet=0,thevelocityisv0=0.Attimet=10s,thevelocityisv1=16.7m/s.Duringthistimeinterval,theaverageaccelerationis.b)Attimet=30s,thevelocityisv2=16.7m/s.Attimet=40s,thevelocityisv3=0km/h.Theaverageaccelerationduringthistimeintervalis.c)Duringthetimeintervalfromt=10stot=3
4、0s,becausethevelocityisn’tchanged,theaverageaccelerationiszero.d)Attimet=0andt=40s,velocitieshavethesamevalue.Sotheaverageaccelerationiszero.2-11a)Fromt=0tot=10s,thevelocityisincreasing.Soduringthistimeinterval,theinstantaneousaccelerationhasthemostpositivevalue.b)Fromtimet=30stot=40s,thevelocityis
5、decreasing.Soduringthistimeinterval,theinstantaneousaccelerationhasthemostnegativevalue.c)Attimet=20s,theinstantaneousaccelerationiszero.d)Becauseattimet=30s,thevelocityis60km/h,andattimet=40s,thevelocityiszero,wegetthefunctionofvelocitywithtime.;(1);;(2)Combinetheequations(1)and(2),weknowA=240,B=-
6、6.0.Sothefunctionofvelocitywithtimeis.Thegeneralexpressionofaccelerationis.Duringthistimeinterval,theaccelerationisconstant,soattimet=35s,theaccelerationis-1.67m/s2.vve)T=5sxaxT=15svvxT=35sxT=25sa2-47a)Accordingtotheequation,theexpressionsofvelocityandaccelerationare;.-----------b)Iftheparticleisre
7、st,thevelocitywillbezero..t1=0.63s;t2=1.60s.c)Attimet1=0.63s,theaccelerationis.Itisnegative.Attimet2=1.60s,theaccelerationis.Itispositive.d)Ifthevelocityisnotchanging,theaccelerationwillbezero..e)Usingthean
