A body weighs 200 N on Earth’s surface. How much does it weigh halfway down to the centre of Earth, assuming uniform density?
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Question

A body weighs 200 N on Earth’s surface. How much does it weigh halfway down to the centre of Earth, assuming uniform density?

G1 Physics · Accepted Answer

Step 1: Below the surface g(d)=g₀(1−d/R). Step 2: Halfway down d=R/2, so W=200(1−1/2)=100 N. Final answer: C — 100 N.