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A pendulum is used to measure graivty on an alient planet. The length of the string is 5m, and it takes 3 seconds to complete a period. What is the gravity reading?
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What is the (magnitude of the) velocity of a rollercoaster at the bottom of a track that is 89.8 m high if it starts from rest? (Use the value g = 9.8 m/s2 for the acceleration of gravity.) Please provide work to explain
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