Q. The time period of a mass suspended from a spring is 5 s. The spring is cut into four equal parts and the same mass is now suspended from one of its parts. The period is now
A) 5 s
B) 2.5 s
C) 1.25 s
D) $\frac{1}{16}\ s$
Explanation
(b) $T = 2\pi\sqrt{\frac{m}{k}},\ T^{'} = 2\pi\sqrt{\frac{m}{4k}} = \frac{T}{2} = \frac{5}{2}s = 2.5\ s$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.