At what height above the earth's surface is the value of $'g'$ is same as in a $200\, km$ deep mine ........ $km$
At what height above the earth's surface is the value of $'g'$ is same as in a $200\, km$ deep mine ........ $km$
- A
$50$
- B
$100$
- C
$150$
- D
$400$
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