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A \( 2 \mathrm{~kg} \) block hangs without vibrating at the bottom end of a spring with a force constant of \( 400 \mathrm{~N} / \mathrm{m} \). The top end of the spring is attached to the ceiling of an elevator car. The car is rising with an upward acceleration of \( 5 \mathrm{~m} / \mathrm{s}^{2} \) when the acceleration suddenly ceases at time \( t=0 \) and
\( \mathrm{P} \) the car moves upward with constant speed \( \left(g=10 \mathrm{~m} / \mathrm{s}^{2}\right) \)

W
The amplitude of the oscillation is
(a) \( 7.5 \mathrm{~cm} \)
(b) \( 5 \mathrm{~cm} \)
(c) \( 2.5 \mathrm{~cm} \)
(d) \( 1 \mathrm{~cm} \)
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