If the initial speed is 6.0 m/s and the vertical drop is 18.0 m, find the final speeds of the three rocks.

Three rocks are thrown from a cliff with the same initial speeds but in different directions: rock A is thrown straight down, rock B is tossed straight up, and rock C is thrown horizontally. Ignore air resistance. We are interested in comparing the speeds of the three rocks just before they hit the flat ground at the bottom of the cliff.