Part A  The ultimate source of energy from fossil fuels is theA) radioactivity in Earth's interior  B) Sun.C) natural processes in Earth's interior. D) photosynthesis process. Part B If you walk toward a mirror at a certain speed, the relative speed between you and your image is A) your speed. B) twice your speed.C) half your speed. D) none of the above Part C To melt 50 g of 0°C ice requires A) 25 calories. B) 80 calories.C) 50 calories  D) none of the above

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