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Ok. Im having trouble with a problem here. Please dont post the answer just help me into the right direction.

A 200 Kg weather rocket is loaded with 100 Kg of fuel and fired staight up. it acclerates upward at 30 (m/s)/s for 30 s, then runs out of fuel. Ignore any air resistance effects.

a) what is maximum altitude?

b) how long is the rocket in the air?

Ok. So I'm pretty sure that the masses are put in to throw you off, and not necessary for the problem. I am having trouble because I am not sure what the upward acceleration would be. Do I just use 30 (m/s)/s and neglect gravity while it goes up, then use only gravity for it falling?? If this is true I can just use simple equations to determine the answers.

Thanks for any help!!!!

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# Homework Help: Simple Problem. Having trouble

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