The value of $g$ at the surface of the earth is $9.8 \, m/s^2$. Then the value of $g$ at a place $480 \, km$ above the surface of the earth will be nearly .......... $m/s^2$ (radius of the earth is $6400 \, km$).

  • A
    $9.8$
  • B
    $7.2$
  • C
    $8.5$
  • D
    $4.2$

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