Fall Distances

The free fall distance due to gravitational force is given by the expression

s = ut+0,5gt²

where

s = fall distance (m)
u = initial velocity (m/s)
t = time interval (s)
g = acceleration due to gravity (m/s²) As previously noted, the value of g to be used throughout this standard is 9,78546 m/s² (Johannesburg).
In this context there is no initial velocity, so the fall distance expression reduces to
s = 0,5 gt² (m)
= 500 gt² (mm)
= 4892,73 t² (mm)
Where necessary, intermediate or extended values may be simply calculated.

Time Interval s	Fall Distance mm
0.05	12
0.10	49
0.15	110
0.20	196
0.25	306
0.30	440
0.35	599
0.40	783
0.45	991
0.50	1223
0.55	1480
0.60	1761
0.65	2067
0.70	2397
0.75	2752
0.80	3131
0.85	3535
0.90	3963
0.95	4416
1.00	4893