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Q.

The system shown in Fig. is initially in equilibrium. When the 500 gm mass is removed, the system oscillates with a time period 4 sec. On removing the 700 gm mass also, time period of oscillation will be:

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a

2 sec

b

3 sec

c

4 sec

d

5 sec

answer is B.

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Detailed Solution

When 500 gm mass is removed then            π=2π900+700k=4 secWhen 700 gm mass is removed then                   T'=2π900k ⇒   T'T=9001600=34 ⇒    T'=3 sec
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