Question

Please help me solve question 13
Hint:
The spring constant of this spring, k, is not the quantity you need in the equation for the period. What you need in that equation is the second derivative of the spring’s energy with respect to the position of the thing that’s oscillating. You need to start by finding the energy stored in the spring as a function of the vertical position, y, of the mass.

Answer 1

for  this  type of spring mass system T=4π√(m/k)

t=4π√(m/k)