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A block of mass 1kg hangs without vibrat...

A block of mass `1kg` hangs without vibrations at the end of a spring with a force constant `1 N//m` attached to the ceilling of an elevator. The elevator is rising with an upward acceleration of `g//4`. The acceleration of the elevator suddenly ceases. What is the amplitude of the resulting oscillations?

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The correct Answer is:
B, D
Additional force
`(mg)/(4) = kA rArr A = (g)/(4) = 2.45m`
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ALLEN -SIMPLE HARMONIC MOTION-Exercise-04 [A]
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