A stuntman of mass 55 kg is to be launched horizontally out of a spring-loaded cannon. the spring that will launch the stuntman has a spring coefficient of 278 n/m and is compressed 4 m prior to launching the stuntman. if friction and air resistance can be ignored, what will be the approximate velocity of the stuntman once he has left the cannon?
a. 32 m/s
b. 21 m/s
c. 15 m/s
d. 9 m/s