Gravity Playing with units

A mass of 10000000 milligram is released from a height of 4000 centimetre above the surface of the Earth .

Calculate its mechanical energy when it is at 2000 centimetre, above the surface of the Earth.


1) Take the acceleration due to gravity as \[g = 10 m / s^2\]

2) Provide your answer in Joules.


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