If g on the surface of the earth is 9.8/ms−2, its value at a depth of 3200km (Radius of the earth=6400km) is
9.8/ms−2,
Zero
4.9/ms−2,
2.45/ms−2,
A
9.8/ms−2,
B
Zero
C
4.9/ms−2,
D
2.45/ms−2,
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Solution
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gd=g(1−dR)
⟹9.8(1−3200×1036400×103)
4.9m/s2
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