∵a=dv/dt=dv/dx·dx/dt=dv/dx·v=vdv/dx a=-KX∴vdv/dx=-Kx∴vdv=-Kxdx∴∫vdv=-∫Kxdx∴½v²=-½Kx²+½C∴V²=-Kx²+C∵X=0时,V=Vo∴C=Vo²∴V²+Kx²=Vo²...