Question

Calculate how long it takes for a stone falling from a bridge with an average acceleration downward of 9.8m/s^2 to hit the water. The stone starts from rest and hits the water with a velocity of 12.3m/s.

Answer 1

If the stone begins from rest and ends with a downward speed
of 12.3 m/s, then it must have spent

(12.3) / (9.8) = 1.26 seconds
falling.