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Question

Apparent weight at bottom most line is

A
2 mg
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B
mg
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C
3 mg
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D
4 mg
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Solution

The correct option is A 2 mg
First, we find spring constant by equating spring force with weight, since it feels weightless at top. kx=mg.
We get K as 200N/m. Now, the apparent weight at bottom is
kx+mg=200×0.05+1×10=20N=2mg.
Option A is thus correct.

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