4. As shown in the figure, all the surfaces of the triangular object M are smooth, the upper surface is horizontal, and
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4. As shown in the figure, all the surfaces of the triangular object M are smooth, the upper surface is horizontal, and
4. As shown in the figure, all the surfaces of the triangular object M are smooth, the upper surface is horizontal, and placed on a fixed smooth slope. Put a smooth ball m on the surface of M, and then release M. What is the acceleration of the ball before it hit the incline? E M
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