I don't understand why you titled this thread "polynomial inequalities." From the data you have been given you have . So the formula becomes:
Rearrange and solve for t.
The function s(t)= -1/2gt2 +v0t +So can be used to calculate s, the height above a planet's surface in meters, where g is the acceleration due to gravity t is the time in seconds,Vo is the initial velocity in meters per second and so is the initial height in meters. The acceleration due to gravity on mars is g=-3.92 m/s2. Find to two decimal places how long it takes an object to hit the surface of mars if the object is dropped from 1000m above the surface.