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10 questions from this quiz
Close to Earth's surface only
Gravity is attractive; closer = less than 0
U=−GMmrU = -\frac{GMm}{r}U=−rGMm
Energy needed to separate objects completely
PE decreases, KE increases
Etotal=−KE_{\text{total}} = -KEtotal=−K
Etotal=−GMm2rE_{\text{total}} = -\frac{GMm}{2r}Etotal=−2rGMm
Speed increases
Mass of the escaping object
11.2 km·s−1^{-1}−1
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