What is the change in internal energy if 20 J of heat is released from a system and the system does 50 J of work on the surroundings?

A.-80 J

B.-20 J

C. 80 J

D. 20 J

A pelican flying drops a fish from a height of 8.1 m. The fish travels 9.3 m horizontally before it hits the ground. The pelican's speed was

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