Two masses,M and m,are hung over a massless,frictionless pul

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Two masses,M and m,are hung over a massless,frictionless pulley as shown below if M>m,what is the downward acceleration of mass M.
用字母表示

两个物体质量分别为：M,m.（M>m）通过绳子连接跨过定滑轮,滑轮重量和摩擦力不计,求物体M的加速度.
解法1、把两个物体看做一个整体.
a=（M-m）g/(M+m)
解法2、设绳子的拉力为：F
则有对M,F=Mg-Ma
对m由：F=mg+ma
故：Mg-Ma=mg+ma
化简：a=（M-m）g/(M+m)

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