Acceleration due to gravity at a height of 1 km above Earth equals that at depth d below the surface. For small height/depth compared with Earth radius, d is:
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Acceleration due to gravity at a height of 1 km above Earth equals that at depth d below the surface. For small height/depth compared with Earth radius, d is:

G1 Physics · Accepted Answer

Step 1: At small height h, gₕ≈g₀(1−2h/R); at small depth d, g(d)≈g₀(1−d/R). Step 2: Equating gives d≈2h=2 km. Final answer: D — 2 km.