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One of the answer choices is "the PE and KE are equal to one another at a time that is 1/8 of the period after it had all gravitational PE", and this statement was true. Can anyone elaborate on this?
Their answer key says "At a point IN TIME that is half way between these two states, the KE must equal PE."
Their answer key says "At a point IN TIME that is half way between these two states, the KE must equal PE."