- #1
Taylor_1989
- 402
- 14
Homework Statement
Rocket motors make a rocket of mass of 2200kg accelerate at 2.5m/s^2 over a distance of 650m in deep space. What is the work done?
The Attempt at a Solution
F=m*a 2200kg*2.5m/s^2 = 5500N
5500*650= 3575000
When I look at the answer page it tells me the force causing acceleration is 11000N. I generally can't see where this figure has come from. The only thing I can see if i double the answer I get it = the answer that is given wd= 7150000.
The only other possible solution I can come to is that, the mass of the rocket decrease as it accelerates, so the original mass of rocket was 4400kg. If I used this figure it would give me the right answer. Is this the right train of thought?