Not the best
I thought you could pick a topic, read the study page and then do the quiz on that topic. Unfortunately they ask you questions for which you haven’t been given a formula to. There was no mention of how to work out stored potential kinetic or elastic energy in the first topic. I had to google the formulas. They don’t even tell you why your multiple choice answer is incorrect. An explanation and workings would be hugely beneficial to a learner.
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