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## Homework Statement

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

## Homework Equations

D= Vi t + 1/2A tsquared

## 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?