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I'm guessing i need to use ep=- GMmG/r

but it would be possitive right?

the radius will be 35800 km? or 42,245 cause the 35800 is the altitude for the satellite?????

m and M is mass of earth and the satellity

so is this how to work out the right answer

6.67*10^-11 (mass of eath)(150)

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35800000 or 42,245 000

Is this the correct way??/