Question

Problem: A ball is dropped from the top of a building that is 250 feet tall. The height h of the ball in feet after t seconds is modeled by the function h = -16t2 +250. How long will it take for the ball to reach the ground? Round your answer to the nearest tenth if necessary.

Answer 1

i got 7.81 for t

Answer 2

0 = -16t^2 + 250
16t^2 = 250
t^2 = 250/16
t = √250/4 = appr 3.95
or 4.0 sec to the nearest tenth