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Question

Block of 3 kg is initially in equilibrium and is hanging by two identical springs A and B as shown in the figure. If spring A is cut from lower point at t=0 then, find acceleration of block in ms2 at t=0.


A
5
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B
10
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C
15
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D
0
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Solution

The correct option is A 5
The given situation can be depicted in two conditions as shown
(1) Before cutting:

From the FBD we get
2kx=3g
kx=15.......(i)

(2)After cutting:

From the FBD we get,
a=3gkx3=30153=153=5 m/s2

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