Two Springs with Force Constants of 50 N/m and 100

Multiple Choice

Two springs with force constants of 50 N/m and 100 N/m are connected in series. A 1.0-kg mass is suspended from the springs. Assuming that the acceleration of gravity is 10 m/s², the total amount of stretch is

A) 13 cm.
B) 30 cm.
C) 40 cm.
D) 50 cm.