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Passage X) A 2kg block hangs without vib...

Passage X) A 2kg block hangs without vibrating at the bottom end of a spring with a force constant of 400 N/m. The top end of the spring is attached to the ceiling of an elevator car. The car is rising with an upward acceleration of `5m/`s^(2)` when the accleration suddenly ceases at t=0 and the car moves upward with constant speed. (g=10m/`s^(2)`)
The amplitude of the osciallations is

A

7.5 cm

B

5 cm

C

2.5 cm

D

1 cm

Text Solution

Verified by Experts

The correct Answer is:
C
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A 2kg block hangs without vibrating at the bottom end of a spring with a force constant of 400 N//m . The top end of the spring is attached to the ceiling of an elevator car. The car is rising with an upward acceleration of 5 m//s^(2) when the acceleration suddenly ceases at time t = 0 and the car moves upward with constant speed (g = 10 m//s^(2) The amplitude of the oscillation is

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