A student records the length $l$ and the oscillation period $T$ for a simple pendulum. He then applies the equation below to determine the acceleration of free fall $g$. $T = 2\pi\sqrt{\frac{l}{g}}$ The measurements are given as: $l = (87.3 \pm 0.2)\,\text{cm}$ $T = (1.9 \pm 0.05)\,\text{s}$ What percentage uncertainty is there in his calculated value of $g$?
- A2.4\%
- B2.9\%
- C5.5\%
- D7.2\%