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## Homework Statement

A person shakes pendulum with length 3.6 meters. For 12 shakes he measured the time of 38 seconds. Find the acceleration due to gravity

## Homework Equations

T=t/n

T=2*pi*sqrt(l/g)

## The Attempt at a Solution

T(period)=t/n=3.167

T=2*pi*sqrt(l/g) l-length

g=4*(pi)^2*l/T^2

g=14.156

The solution in my book is 9.4 m/s^2. Where is my error?