Functions, help! 5 Points
Favorites|Homepage
Subscriptions | sitemap
HOME > Mathematics > Functions, help! 5 Points

Functions, help! 5 Points

[From: ] [author: ] [Date: 11-09-27] [Hit: ]
1 seconds.-You have to substitute 0 for height to find out how long until it has a height of zero. Then, you just solve for the time.......
The height, h, in metres, above the ground of a football t seconds after it is thrown can be modelled by the function h(t)= -4.9t^2 + 19.6t + 2. Determine how long the football will be in the air, to the nearest tenth of a second.

-
The football is in the air as long as h is a positive number. Thus, when the height is zero, the ball has hit the ground. The key is to find what positive value of t (what time) yields a zero value for h.

To solve this problem, set the function modeling the height of the ball equal to zero.

Now, either using a graphing calculator or the quadratic formula (-b plus or minus the square root of (b^2 - 4ac), all divided by 2a), you can solve for t. You should get t = 4.0995626. If you plug this into the equation, you should get h = 0.

Since you want the answer to the nearest tenth of a second, the final answer is 4.1 seconds.

-
You have to substitute 0 for height to find out how long until it has a height of zero. Then, you just solve for the time.
1
keywords: Points,help,Functions,Functions, help! 5 Points
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .