Yaar, it cancels out because the math shows both gravitational potential energy and kinetic energy are proportional to mass — so it divides out, leaving only G, M of Earth, and radius. But let me tell you, in my life, nothing ever just 'cancels out'! My guitar's EMI is a constant mass on my mind, no matter how many small gigs I play. Still, physics gives a neat escape, even if my bank account doesn't.
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