Question

A pen drops from the top of a desk that is 4 feet tall. The distance from the pen to the ground can be modeled by the equation below, where h(t) is the height from the ground and t is the time in seconds, How long will it take for the pen to reach the ground? Round your answer to the nearest tenth of a second

h(t)=-16t^2+4

Answer 1

0.5 seconds

Explanation:

On the ground, height is 0

-16t² + 4 = 0

16t² = 4

t² = 4/16

t² = ¼

t = ½