Find how many seconds pass before the object reaches the ground.

Question

An object is dropped from 31 feet below the tip of the pinnacle atop a 1475​-ft

tall building. The height h of the object after t seconds is given by the equation h=−16t2+1444. Find how many seconds pass before the object reaches the ground

Answer 1

Set h=0 and solve for t. You will get a positive and a negative value for t. The positive value is the correct one.