A small ball with a mass of 55.0 g is loaded into a spring gun, compressing the spring by 15.0 cm. When the trigger is pressed, the ball emerges horizontally from the barrel at a height of 1.70 m above the floor. It then strikes the floor, after traveling a horizontal distance of 2.40 m. Use g = 9.80 m/s2. Assuming all the energy stored in the spring is transferred to the ball, decide the spring constant of the spring.