Acceleration in what direction? horizontal? vertical? centripetal? angular?
Acceleration at what time? What is the amplitude of the oscillation? That affects the answer.
The horizontal (x) acceleration for small displacements varies with time as
ax = -(amplitude)*w^2*sin wt
where
w = sqrt(g/L)
finding the acceleration of a simple pendulum
g= 4pi^2 x length/T^2
T^2= 2.28
length= 70cm
3 answers
its a simple pendulum brass ball.
hung from a string swinging with no applied pressure. the pendulum was drawn into the air 20 cm from the center. and swings to the other side. same distance 20 cm
hung from a string swinging with no applied pressure. the pendulum was drawn into the air 20 cm from the center. and swings to the other side. same distance 20 cm
So the amplitude is 20 cm. You can use the formula I gave for the x acceleration, but you never said which acceleration you want.