One end of a long metallic wire of length L is tied to the ceiling. The other end is tied to massless spring of spring constant k. A mass m hangs freely from the free end of the spring. The area of cross-section and Young's modulus of the wire are A and Y respectively. If the mass is slightly pulled down and released, it will oscillate with a time period T equal to

 

A body is executing simple harmonic motion with frequency n the frequency of its potential energy is

 NEET 2021 SHM BASED QUESTION   answer: 2n