<span>Дано:</span>
<span>t</span>1=2<span>c</span>
<span>V</span>1=5<span>м</span>/<span>c</span>
<span>t</span>2=3<span>c</span>
<span>V2=7</span><span>м</span><span>/c</span>
<span>Vcp-?</span>
<span>Vcp=S/t, <span> </span>S=S1+S2, t=t1+t2</span>
<span>S1=V1*t1,<span> </span>S1=5*2=10</span><span>м</span>
<span>S2=V2*t2,<span> </span>S2=7*3=21</span><span>м</span>
<span>S</span><span>=10м+21м=31</span><span>м</span>,<span> </span><span>t</span>=2<span>c</span>+3<span>c</span>=5<span>c</span>
<span>Vcp</span>=31/5=6,2м/с