A rock is dropped from a tree of height 22 m into a lake (depth 4.0 m) below. After entering the water, the rock floats gently down through the water at a constant speed of 1.4 m/s to the bottom of the lake. What is the total elapsed time?

Answer 1

h = 0.5g*t1^2 = 22 m.
g = 9.8 m/s^2.
t1 = ?.

1.4m/s * t2 = 4 m.
t2 = ?.

T = t1 + t2.