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The acceleration due to gravity at height h above the earth if h << R (Radius of earth) is given by

1. g' = g ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 2 2 R 2 h – 1
2. g' = g ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ R 2 h – 1
3. g' = g ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ R h 2 – 1
4. g' = g ⎟ ⎟ ⎠ ⎞ ⎜ ⎜ ⎝ ⎛ 2 2 R h 2 – 1

Correct answer: g' = g ⎟ ⎠ ⎞ ⎜ ⎝ ⎛ R h 2 – 1

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