GravitationMedium
Question
If the gravitational acceleration at surface of Earth is g, then increase in potential energy in lifting an object of mass m to a height equal to the radius R of Earth will be : -
Options
A.
B.2mgR
C.mgR
D.
Solution
PEi = - 
= - mgR ; PEf = - 
= -
Increase in PE is
= - mgR ; PEf = - = -Increase in PE is
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