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a) U = m g' (R + h) – m g R = m g R²/(R+h) – m g R
U = m g R (R/(R+h) – 1) = - m g R h/(R+h)
U = -94*9.8*6371000*1.96*10^6/(6371000 + 1.96*10^6)
U= -1380767230 J
U= -1380.767*10^6 J
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