Small g is acceleration due to gravity on Earth’s surface, about 9.8 m/s². Capital G is the universal gravitational constant, a tiny number that works everywhere in space. Honestly, in our textbook problems, the real difference is that mixing them up costs you three marks in the exam. And I can’t afford to lose marks; I need a good grade to get a scholarship, because Appa’s salary barely covers Amma’s medicines.
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