Ответ: [tex]S(t)=A+Bt+Ct^2+Dt^3\\v(t)=S'(t)=B+2Ct+3Dt^2\\a(t)=v'(t)=2C+6Dt\\\\2*0,14+6*0,1*t=1\\t=1,2(s)\\\\2*0,14+6*0,1*t=6\\t=9,533(s)\\\\S(1)=A+2+0,14+0,1=A+2,24\\S(6)=A+12+5,04+21,6=A+38,64\\v_{cp}=\frac{S(6)-S(1)}{t_6-t_1}=\frac{A+38,64-A-2,24}{9,533-1,2}=4,368(m/s)[/tex]