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A student is completing various experiments using a wooden block in different scenarios. In which of the following scenarios is the block-earth system considered to be an open system? Neglect drag. Select two answers. A. The block is pushed across a floor at an increasing speed. B. The block slides across a rough floor. C. The block falls from the top of a building. D. The block slides across a frictionless surface.

A student is completing various experiments using a wooden block in different scenarios. In which of the following scenarios is the block-earth system considered to be an open system? Neglect drag. Select two answers. A. The block is pushed across a floor at an increasing speed. B. The block slides across a rough floor. C. The block falls from the top of a building. D. The block slides across a frictionless surface.

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A student is completing various experiments using a wooden block in different scenarios.
In which of the following scenarios is the block-earth system considered to be an open system? Neglect drag. Select two answers. A. The block is pushed across a floor at an increasing speed. B. The block slides across a rough floor. C. The block falls from the top of a building. D. The block slides across a frictionless surface.

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