The value of gravitational acceleration $g'$ at a height $h$ above the earth's surface is $\frac{g}{4}$. Then,what is the value of $h$ in terms of the earth's radius $R$?
- A$h=R$
- B$h=\frac{R}{2}$
- C$h=\frac{R}{3}$
- D$h=\frac{R}{4}$
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