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A block with a mass of 2 kg hangs withou...

A block with a mass of `2 kg` hangs without vibrating at the end of a spring of spring constant `500N//m`, which is attached to the ceiling of an elevator. The elevator is moving upwards with an acceleration `(g)/(3)`. At time `t = 0`, the acceleration suddenly ceases.
(a) What is the angular frequency of oscillation of the block after the acceleration ceases ?
(b) By what amount is the spring stretched during the time when the elevator is accelerating ?
(c )What is the amplitude of oscillation and initial phase angle observed by a rider in the elevator in the equation, `x = Asin (omega t + phi)` ? Take the upward direction to be positive. Take `g = 10.0 m//s^(2)`.

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