Astone falls from the top of a 125m high cliff.
how long does it take to reach the sea?
i know that s[distance] is 125m, and that a[acceleration] is 10m/s².
considering the equations of motion- i can find the answer only if i receive another piece of information as final velocity, or initial velocity.

Onsider a u-tube whose arms are open to the atmosphere. now, equal volumes of water (ρ = 62.4 lbm/ft3) and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and thus the liquid levels in the two arms are the same. if the fluid height in each arm is 31 in, determine the gage pressure the person exerts on the oil by blowing. (round the final answer to three decimal places.)