一个质量mA为4kg的木板A放在水平面C上,木板与水平面间的动摩擦因数u=0.24,木板右上端放着质

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1）I=mB*V0
V0=I/mB=12 / 1=12 m/s
2）对B,F*SB=EkB
F* t =mB*VB
对A,[ F+u*(mA＋mB*)g ]*SA=(mA*V0^2 / 2)－EkA
[ F+u*(mA＋mB*)g ]* t =mA*(V0－VA)
SA－SB=L
以上五式联立,得
L=21.3125米 　文字输入有限.
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