Given that,
Acceleration due to gravity = g
Time period :
Time period is defined as,
[tex]T = 2\pi\sqrt{\dfrac{l}{g}}[/tex]
Where, l = length of pendulum
g = acceleration due to gravity
We need to calculate the value of g
Using formula of time period
[tex]T=2\pi\sqrt{\dfrac{l}{g}}[/tex]
[tex]g=\dfrac{4\pi^2l}{T^2}[/tex]
Where, T = time period
l = length of pendulum
Hence, The value of g is [tex]\dfrac{4\pi^2l}{T^2}[/tex]