If the gravitational acceleration at the Earth's surface is 9.81 m/s², what is its value at a height equal to the diameter of the Earth from its surface?
(A) 4.905 m/s²
(B) 2.452 m/s²
(C) 3.27 m/s²
(D) 1.09 m/s²
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a is the answer .... .....
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