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Q.

A spring – mass system is hanging from the ceiling of an elevator in equilibrium. The elevator suddenly starts accelerating upwards with acceleration 5m/s2.  If mass of the block is 1 kg and force constant of the spring is 1000 N/m, the amplitude of oscillation is 

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a

15 mm

b

5 mm

c

10 mm

d

5 cm 

answer is D.

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Detailed Solution

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Amplitude=mg+ak−mgk=mak=1×51000 × 103 mm=5mm

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