# Rocket's forces and acceleration

1. Dec 22, 2009

### ybm

1. The problem statement, all variables and given/known data

A rocket has a mass of 3.04x10(6)kg. It takes off vertically with a thrust force of 3.40x10(7)N.

Find:

(a) The resultant force.
(b) The initial acceleration
(c) After reaching a speed of 2390ms(-1) after 150seconds, the average acceleration.

2. Relevant equations

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3. The attempt at a solution

I'd really appreciate someone to provide some help with this, I'm quite stuck :(

Thanks :)

2. Dec 22, 2009

### jegues

What other forces are acting on the rocket?

3. Dec 22, 2009

### ybm

Gravity.

4. Dec 22, 2009

### jegues

So why are you having trouble calculating the resultant force? Did you even try the problem... Next time make an attempt at the solution otherwise you're not going to learn anything.

5. Dec 22, 2009

### ybm

Jegues,

Of course I attempted it, but I do not understand it. Hence why I am asking for assistance.

Thank you.

6. Dec 22, 2009

### jegues

If you attempted it and are having troubles, show us your work.

7. Dec 22, 2009

### ybm

Hi Jegues,

I seem to have worked out that, I'm going to check the answers and if it's wrong I'll reply to this thread to see where I've gone wrong.

Thanks!

8. Dec 22, 2009

No problem.