Vt=V0+at所以 Vt*Vt-V0*V0=V0*V0+2V0at+at*at-V0*V0 =2V0at+at*at =2a(2V0t+at*t/2)因为s=2V0t+at*t/2所以 Vt*Vt-V0*V0=2as