The period t of a simple pendulum is given by t = 2π formula887.mml, where l is the length of the pendulum and g is the acceleration due to gravity. thus if l and t are measured, we can estimate g with g = 4π2l/t2. assume that the period is known to be t = 1.49 s with negligible uncertainty and that l is measured to be 0.559 ± 0.005 m. estimate g, and find the uncertainty in the estimate. note: when doing calculations, use pi = 3.1416.