a 10-cm-long spring is attached to the ceiling. when a 1.5 kg mass is hung from it, the spring stretches to a length of 18 cm. (it is extended 5 cm past the equilibrium length). How long is the spring when a 4.0 kgmass is suspended from it? Assume in both cases the mass is stationary and in stable equilibrium when thespring extension is measured.A. 15 cmB. 20 cmC. 22 cmD. 25 cmE. 30 cm