A geologist needs to determine the local value of g. Unfortunately, his only tools are a meter stick, a saw, and a stopwatch. He starts by hanging the meter stick from one end and measuring its frequency as it swings. He then saws off 20 cm—using the centimeter markings—and measures the frequency again. After two more cuts, these are his data:

   Length (cm)..................Frequency (Hz)

100....................................0.61

80....................................0.67

60....................................0.79

40....................................0.96

Use the best-fit line of an appropriate graph to determine the local value of g.