x=Acos(@t+o) XXXXXXXXXXX) Ek= 1v2-mo2A2sin2(0t+p） 2 1 kx2 =-kA2 cos2(@t+) 2)(sin 21 21 2 222 k == ω tAmmvE + ϕω )(cos 21 21 2 22 p == kAkxE t +ϕω t x = ωtAx +ϕ )cos( o Ek t E o Ep 2 2 1 = kAE