Newton's First Law of Motion.......Help me!!!?

Question

1. An airplane has a mass of 29,000 kg and takes off under the influence of a constant net force of 45,000 N. What is the net force that acts on the plane's 80 kg pilot????
Why? How?

2. During a circus performance, a 71kg human cannonball is shot out of a 15m long cannon. If the human cannonball spends 0.82 s in the cannon, determine the average net force exerted on him in the barrel of the cannon.

Answer 1

I believe that the first two Newton's Laws are about "constant speed without net force acting on it" and "action and reaction". Your problems, however, need to use Newton's third law to solve.

(1) Please remember that F = ma, and that the 29,000 kg airplane and the 80 kg pilot have the same accelaration a. Thus f/F = m/M. The force on the pilot is:
f = 80*45000/29000 = 124(N)

(2) S = 0.5a*t^2 and F = ma
So: F = m(2S/t^2) = 71*2*15/0.82^2 = 3.2(kN)