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A rocket is fired vertically from the ground. It
P moves upwards with a constant acceleration of

W \( 10 \mathrm{~m} / \mathrm{s}^{2} \). After 30 seconds the fuel is finished. After what time from the instant of firing the rocket will it attain the maximum height? \( g=10 \mathrm{~m} / \mathrm{s}^{2} \) :
(1) \( 60 \mathrm{~s} \)
(2) \( 45 \mathrm{~s} \)
(3) \( 90 \mathrm{~s} \)
(4) \( 65 \mathrm{~s} \)
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