An airline pilot climbs to a new flight level along the path shown. The motion of the airp...

An airline pilot climbs to a new flight level along the path shown. The motion of the airplane between A and B is defined by the relation s = 3t (180 – t), where s is the arc length in feet, t is the time in seconds, and t = 0 when the airplane is at point A. Determine the force exerted by his seat on a 165-lb passenger (a) just after the airplane passes point A, (b) just before the airplane reaches point B.

Fig. P12.47