A seconds pendulum is one that takes one second to swing to an extreme position and return to the equilibrium position. This gives the time period of a seconds pendulum as 2 seconds. The time period of any pendulum of length L is equal to 2*pi*sqrt(L/g) where g is the free fall acceleration.

As the length of the seconds pendulum in Cambridge is 0.9943 m, it gives:

2 = 2*pi*sqrt(L/g)

=> sqrt(L/g) = 1/pi

=> L/g = 1/pi^2

=> g = L*pi^2

=> g = 9.813347 m/s^2

The correct answer is option 1, 9.81335 m/s^2

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