A 250g (1/4 kg) mass is hung from a vertical spring with a spring constant of 98 N/m. If y = 0 is at the bottom end of the spring when it is neutral (no mass hanging), what is the new equilibrium position when the mass is attached, in units of cm? Assume the y-axis points vertically upward.

Answer to best of ability, no reference needed! Will leave good rating!