The 120-lb man acts as a human cannonball by being "fired" from the spring-loade...

The 120-lb man acts as a human cannonball by being "fired" from the spring-loaded cannon shown. If the greatest acceleration he can experience is a = 10g = 322 ft/s², determine the required stiffness of the spring which is compressed 2 ft at the moment of firing. With what velocity will he exit the cannon barrel, d = 8 ft, when the cannon is fired? When the spring is compressed s = 2 ft then d = 8 ft. Neglect friction and assume the man holds himself in a rigid position throughout the motion.