Posted by onda on Friday, May 21, 2010 at 12:56am.
The reaction force is
F = Vexhaust*(mass flow rate)
= 40*0.2 = 8 Newtons
The acceleration rate is F/m = 2 m/s^2
Since that is less than g (which is 9.8 m/s^2), it won't leave the ground. It better have wheels if it is going anywhere.
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