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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 initial phase angle observed by a rider in the elevator, taking upward directioin to be positive and positive extreme position to have `pi/2` phase constant, is equal to

A

zero

B

`pi//2`rad

C

`pi` rad

D

`3pi/2`rad

Text Solution

Verified by Experts

The correct Answer is:
D
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