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Question

A mass of 1 kg attached to the bottom of a spring has a certain frequency of vibration. The following mass has to be added to it in order to reduce the frequency by half

A
1 kg
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B
2 kg
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C
3 kg
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D
4 kg
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Solution

The correct option is C 3 kg
frequency ω
ω=km
m=1Kg
In order to reduce the frequency to hallf
ω2=km
12k1=km
m=4Kg
mass that is to be added=41=3Kg

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