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A rocket  is fired  vertically  and  ascends  with  a constant vertical acceleration   of 20 m/s2   for 1.0 min. Its fuel is then all used and  it continues   as  a free-fall   particle.   (a)  What  is the  maxi- mum  altitude  reached?  (b) What  is the total time elapsed  from take off  until  the rocket  strikes  the Earth?  (Ignore  the variation of g with  altitude).
2 years ago

Sooryakiran
25 Points
a) s=1/2at^2      =1/2 x 20 x 60 x 60      =36 kmB) t = time to go up + time to reach zero speed under gravity + time to fall free from that altitude.

2 years ago
Soumith Chowdary
48 Points
Use S=ut+1/2at^2 here S=1/2x20x60x60 S =36000 t=60+60 t=120s because time of ascent =time of descent. u=0

2 years ago
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### Course Features

• 110 Video Lectures
• Revision Notes
• Test paper with Video Solution
• Mind Map
• Study Planner
• NCERT Solutions
• Discussion Forum
• Previous Year Exam Questions