A professor uses a video camera to record the motion of an object falling from a height of 250 meters. The function f(x) = –5x2

Question

3 years ago

8

A professor uses a video camera to record the motion of an object falling from a height of 250 meters. The function f(x) = –5x2

+ 250 can be used to represent the approximate height of the object off the ground after x seconds. Which is the best estimate for the amount of time elapsed when the object is 120 meters off the ground?
4 seconds
5 seconds
6 seconds
7 seconds

Mathematics

2 answers:

Romashka [77] · Answer 1 · 2022-05-13T18:11:42+03:00

Romashka [77]3 years ago

8 0

Answer:

The answer is approximately 5.09 seconds.

Step-by-step explanation:

The given equation is:

f(x) = -5x^2 + 250

To find the elapsed time, x, set the equation equal to 120 and solve for x:

-5x^2 + 250 = 120

-5x^2 = -130

x^2 = -130/-5 = 26

x = Sqrt(26) = 5.09 seconds.

e-lub [12.9K] · Answer 2 · 2022-05-13T19:50:10+03:00

e-lub [12.9K]3 years ago

3 0

Answer:

B

Step-by-step explanation: