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# Velocity-time graph for a rocket

Physics and electronics discussion, revision, exam and homework help.

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1. Velocity-time graph for a rocket
Please look at the question attached.

thanks

----
here is the only answer I can think of:
the further away the rocket is from earth the smaller its gravitational attraction to earth. Therefore the greater the resultant force (away from earth) so its acceleration increases rapdily

is this correct?
Attached Thumbnails

2. Re: Velocity-time graph for a rocket
There is other stuff in space BTW
3. Re: Velocity-time graph for a rocket
(Original post by siwelmail)
There is other stuff in space BTW
so then why is it C??
4. Re: Velocity-time graph for a rocket
I would say you were correct, as the force from the rocket is constant, and the gravitational attraction from the earth decreases with distance. F=ma, so acceleration increases as resultant force increases.
5. Re: Velocity-time graph for a rocket
(Original post by ilovemath)
so then why is it C??
Velocity= Displacement from start/time.

Work it out yourself with words, relating to the rocket.
6. Re: Velocity-time graph for a rocket
(Original post by ilovemath)
Please look at the question attached.

thanks

----
here is the only answer I can think of:
the further away the rocket is from earth the smaller its gravitational attraction to earth. Therefore the greater the resultant force (away from earth) so its acceleration increases rapdily

is this correct?
Yes. That's the reason why the answer is C.
7. Re: Velocity-time graph for a rocket
(Original post by Stonebridge)
Yes. That's the reason why the answer is C.
thanks

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Last updated: May 18, 2012
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