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Suppose you increase your walking speed from 7 m/s to 13 m/s in a period of 2 s. what is your acceleration?
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1. jay fills a wagon with sand (about 20 kg) and pulls it with a rope 30 m along the beach. he holds the rope 25° above the horizontal. the rope exerts a 20-n tension force on the wagon. how much work does the rope do on the wagon?
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What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?
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