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Physics, 26.10.2021 02:30 wassupb66

If the law of conservation of energy applies to a situation, then: A. matter is entering and leaving the system.
B. the output work being done is greater than the work being put into
the system.
C. the system is an open one.
D. the total (PE + KE) before an event is equal to the total (PE+ KE)
after the event.
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