来自申宝宁的问题
有关能量守恒的Ipushacartupwithaconstantforceupaslopetoaheightof1/4meter.Themassofthecartis1/4kg.Thecartmoves1/2meteralongthetableasIdothis.AfterIletitgo,thecartcontinuesuptheslopeuntilitreachesa
有关能量守恒的
Ipushacartupwithaconstantforceupaslopetoaheightof1/4meter.Themassofthecartis1/4kg.Thecartmoves1/2meteralongthetableasIdothis.AfterIletitgo,thecartcontinuesuptheslope
untilitreachesaheightof1/2meterandthenstartsbackdown.WhatwasthemagnitudeoftheforcewithwhichIpushedthecart?
45/√5、
