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So walking up hill is harder than walking level, but doesn't gravity pull the body vertical not back towards the bottom of the hill? - Quora
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Q: Why does gravity pull things toward the center of mass? What's so special about the center of mass? | Ask a Mathematician / Ask a Physicist
When does the effect of gravity (weight) on an object begin to decline as one body enters another? Our weight decreases as we ascend up and away from the earths surface. What
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