设子弹打入木块后子弹和木块的速度为Vt,由动量守恒得:
M子弹*V0=(M子弹+M木块)*Vt,得Vt=M子弹xV0/(M子弹+M木块)
再有能量守恒得:
(1/2)*(M子弹+M木块)*Vt^2=(1/2)*K*S^2+u*(M子弹+M木块)g*S
设子弹打入木块后子弹和木块的速度为Vt,由动量守恒得:
M子弹*V0=(M子弹+M木块)*Vt,得Vt=M子弹xV0/(M子弹+M木块)
再有能量守恒得:
(1/2)*(M子弹+M木块)*Vt^2=(1/2)*K*S^2+u*(M子弹+M木块)g*S