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Question

The right bodies A and B of masses 2 kg and 4 kg respectively are rigidly connected to a spring of the constant 400 N/m. The body B rests on a horizontal table, from the rest position, the body A is compressed by 2 cm and then released. Find the frequency of oscillation.

A
1.60 Hz
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B
2.25 Hz
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C
1.12 Hz
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D
3.18 Hz
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Solution

The correct option is B 2.25 Hz
Given,
Mass of body A (mA)=2 kg
Mass of body B (mB)=4 kg
Force constant (K)=400 N/m
Frequency of oscillation (v)=12πKmA
=12π4002
=2022π=2.25 Hz

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