A 125 G Pendulum Bob Hung on a String of Length

Multiple Choice

A 125 g pendulum bob hung on a string of length 35 cm has the same period as when the bob is hung from a spring and caused to oscillate.What is the spring's elastic constant?

A) 1.9 N/m
B) 3.5 N/m
C) 5.2 N/m
D) 27 N/m