Gravitational potential calculation

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Sanosuke Sagara
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I have my question and solution in the attachment that followed.
 

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do you know calculus? if yes, review the way you did dV/dr, if dr = (400000-39000) or (410000-400000), the answer will be closer, your second part is right...
 
the solution might expect you use the data table, so the number have some error...