m7:=0.01kg r/m -008-0.04O004008 T T x=(0.08m)cos[(S-)t+] t=1.0s代入上式得=-0.069m F=-hx=-motx =-(0.01kg)(s-)2(-0.069m)=1.70×103N 0.08 0.04 o 0.04 0.08 x / m v ] 3 π s ) 2 π (0.08 m) cos[( 1 x t t 1.0s 代入上式得 x 0.069m F kx m x 2 s ) ( 0.069m) 2 π (0.01kg)( 1 2 1.70 10 N 3 m 0.01kg