From what height did the body fall if it passed the last meter of its path in 54 ms?

Let’s determine the speed of the body before falling:
v = 1: 54 * 10 ^ -3 = 18.5 m / s.
Next, we use the formula: S = (v-v0) / 2a, where v is the final speed, v0 is the initial speed (V0 = 0), and the acceleration (in the specific case a = g), the distance traveled equal to the height in a specific problem:
S = v / 2 * g = 100 m.