Question

You drop a feather from a height of 160 centimeters. The function h= -16x^2 + 160 represents the height H (in centimeters) of the feather after x seconds. How long does it take the feather to touch the ground?

Answer 1

Answer:

3.16

Step-by-step explanation:

At the ground, h = 0.

h = -16x^2 + 160

0 = -16x^2 + 160

16x^2 = 160

x^2 = 10

x = +\- sqrt(10)

Since we cannot have a negative time, we discard the negative answer.

Answer: 3.16 seconds