Question

If the length of a simple pendulum is doubled then the % change in the time period is :

Answer 1

please see attached file..

Answer 2

Time period= 2π√l/g
new time period =2π√2l/g
%age change = change in time period /initial time period ×100
__after solving we get (√2-1)×100%=41.4%__
hope it helps