A rocket is fired vertically from the ground. It moves upwards with a – InterviewSolution

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1.	A rocket is fired vertically from the ground. It moves upwards with a constant acceleration `10m//s^(2)` after 30 sec the fuel is finished. After what time from the instant of firing the rocket will attain the maximum height? `g=10m//s^(2)`:-A. 30sB. 45sC. 60sD. 75s
Answer» Correct Answer - C For upward motion `rArr` velocity after 30 sec. v=u+at `v=0+10xx30=300 m//s` Now fueld is finished then, time taken to reach maximum height `rArr` using v=u+at `0=300-10xt` `t=(300)/(10)=30` sec So total time `=30+30=60` sec.

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