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A spring whose stiffness is 1020 N/m has a relaxed length of 0.46 m. If the length of the spring changes from 0.31 m to 0.87 m, what is the change in the potential energy of the spring?
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Question: You are standing on a skateboard, initially at rest. A friend throws a very heavy ball towards you. You can either catch the object or deflect the object back towards your friend (such that it moves away from y ...
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