The time taken for a stone dropped from rest to fall vertically through 16 m is 2.0 s. Based on these measurements, what is the best estimate for the acceleration of free fall?

A.     \(4.0{\text{ m}}\,{{\text{s}}^{ - 2}}\)

B.     \(8.0{\text{ m}}\,{{\text{s}}^{ - 2}}\)

C.     \(9.8{\text{ m}}\,{{\text{s}}^{ - 2}}\)

D.     \(10{\text{ m}}\,{{\text{s}}^{ - 2}}\)

B