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Q.

A mass m attached to a spring oscillates every 2 sec. If the mass is increased by 2 kg, then time-period increases by 1 sec. The initial mass is

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a

1.6 kg

b

3.9 kg

c

9.6 kg

d

12.6 kg

answer is A.

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Detailed Solution

T=2πmk⇒T2T1=m2m1⇒32=m+2m⇒94=m+2m⇒m=85kg=1.6 kg
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