A person standing at the edge of a seaside cliff kicks a stone over the edge with a speed of vi = 11 m/s. The cliff is h = 55 m above the water's surface, as shown below.

Question

How long does it take for the stone to fall to the water?

Answer 1

The initial speed, which is horizontal, does not matter. You only need to solve the equation for vertical motion.

55 m = (g/2) t^2 = 4.9 t^2