A certain freely falling object requires 1.50 seconds to travel the las 30.0 meters before it hits th ground. From what height above the ground did it fall?

Answer 1

V = 30m/1.5s = 20 m/s = Final velocity.

h = (V^2-Vo^2)/2g.
h = (400-0)/19.6 = 20.41 m.