1. The problem statement, all variables and given/known data A model rocket releases its first stage when it is 100.0 m above the ground and moving upward at 40.0 m/s. Ignoring air resistance, find: the time it takes the first stage to hit the ground 2. Relevant equations Y=Yo+VyoT+1/2GT^2 Quadratic 3. The attempt at a solution I got to [-(40)+-Squareroot(1600-1960)]/9.8 the problem is that the square root of a negative number is an imaginary number so I am just wondering what I am missing here?