A laboratory animal exercised on a treadmill, which, through pulleys, raised a mass of 200 g through 1.55 m. At the same time, the animal lost 5.0 J of energy as heat. Disregarding all other losses and regarding the animal as a closed system, what is its change in internal energy?

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A: The answer to this is attached in the image below.

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A: Hi there! Since you have posted multiple questions, we will answer the first question for you.

Q: change in the internal energy

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