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"Show that" questions are a distinctive feature of physics exams. Unlike standard calculations where you work towards an unknown answer, in a "show that" question you are given the answer and your job is to prove it through clear, logical working. These questions are common across all three Edexcel papers and appear frequently in mechanics, fields, waves, and energy calculations.
In a standard calculation, you work from known values to find an unknown. In a "show that" question, the answer is provided — but this does not make it easier. In fact, many students find these questions harder because:
Follow this process for every "show that" question:
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