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governing equation:
Torque=J*(angular acceleration) with respect to any point
if calcuate with respect to contact point
J*alpha=J*(a/R)=(1/2*M*R^2+M&R^2)*(a/R)
also Torque==F*2R
F*2R＝(1/2*M*R^2+M*R^2)*(a/R)
=> a=4F/3M
当然如果有滑动的话，这个答案就不对了
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