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PearlyD
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Homework Statement
A Saturn V rocket has a mass of 2.75x10^6 Kg and exerts a force of 3.3x10^6N on the gases it expels.
determine the initial vertical acceleration of the rocket.
2. The attempt at a solution
heres my attempt...
F=3.3x10^6N
Fg=
M=2.75x10^6
Fnet-MA
F-Fg=ma
F-mg=ma
3.3x10^6-(2.75x10^6)(9.8)=2.75x10^6a
3.3x10^6-2.6x10^7=2.75x10^6a
-2.2x10^7=2.75x10^6a
-2.2x10^7/2.75x10^6=a
a=-8
The accual answer is 2.2m/s^2
Can someone explain to me what i got wrong?