1. The problem statement, all variables and given/known data A person standing at the edge of a cliff kicks a stone over the edge with a speed of 20m/s. The cliff is 51m above the water. Gravity acceleration is 9.8m/s how long does it take the stone to fall and hit the water, answer in seconds 2. Relevant equations D= Vi t + 1/2A tsquared 3. The attempt at a solution 51m = D Vi = 20m/s A = 9.8m/s t= ??? when i solve for that i get 2.551 = t + tsquared how do i solve for t at that point?