U-Asin(到=-×0.24xsin Jπ 3 =-0.326m/s 2m2=1 E水- ×10×103×0.326)2 =5.31×104J kx2=0 其mw2x2 2×10×103x(22×0.12)2 =1.77×104U Ek=Ek+Ep=7.08×104J 结束返回 =-0.326m/s v= ωA sin ( ) 2 πt = ×0.24× 3 π 2 π sin 1 2 Ek mv2 = = ×10×10-3×(0.326)2 1 2 =5.31×10- 4 J 1 2 EP kx 2 = 1 2 m 2 = ω x 2 = ×10×10-3× 1 2 ×(0.12) ( ) 2 2 π 2 =1.77×10- 4 J Ek =Ek +Ep =7.08×10- 4 J 结束 返回