Time period of a pendulum is given by the formula, T= 2pi * sqrt(l/g)
So if the length is increased by 44% i.e l’= 1.44l
The new time period, T’=2pi *sqrt(1.44l/g) = 2pi *1.2 * sqrt(l/g)
So the new time period is 1.2 times of the old one or you can say it increased by 20%.
