(1)t时刻质点的速度：v=vo-(2t/2)t=vo-t^2=1-t^2t时刻质点的位置：s=xo+∫vdt=xo+∫(vo-t^2)dt=xo+vot-1/3t^3=3+t-1/3t^3(2)v=1-t^2=0 t=1ss=3+t-1/3t^3=3+1-1/3*1^3=11/3ma=-2t=-2*1=-2m/s^2(3)s'=t-1/3t^3=1-1/3*1...