0.06=0.12c0s0 1 =coS →0=士 3 13 2 元 3 振动式：X=0.12c0s(1-孕
3 π cos 2 1 ϕϕ ±=→= 3 π ϕ −= 振动式： ) 3π x = cos(12.0 πt − x -π/3 = cos12.006.0 ϕ
40s=0.12co8(t-3）=0.103(m） dx 5= dt =-0.12xsinπt-牙Xag t=0.5 =-0.189(m/s) dv t=0.5 0.12 cos( =-1.03(m/s2)
5.0 5.0 5.0 ) 3π 12.0 πsin(π dd = = = −== − t t t t t x v 5.0 2 5.0 5.0 ) 3π 12.0 π cos(π dd = = = −== − t t t t t v a )m(103.0) 3π cos(12.0 π 5.0 = =− = x t t −= )m/s(189.0 )m/s(03.1 2 −=