Math Problem Statement
A cannon ball is launched into the air with an upward velocity of 227 feet per second, from a 15-foot tall cannon. The height β of the cannon ball after π‘ seconds can be found using the equation β=-16π‘2+227π‘+15.
Approximately how long will it take for the cannon ball to be 426 feet high? Round answers to the nearest tenth if necessary. units:
How long long will it take to hit the ground? units:
Solution
To solve these problems, we'll use the given equation for the height of the cannonball:
1. Time to reach 426 feet
We need to find the time when the height is 426 feet. Set and solve for :
Rearrange this into a standard quadratic equation form:
Use the quadratic formula , where , , and :
First, calculate the discriminant:
Now, solve for :
This gives us two possible solutions:
So, the cannonball will reach a height of 426 feet at approximately 2.1 seconds and again at 12.1 seconds.
2. Time to hit the ground
To find out how long it takes for the cannonball to hit the ground, we set :
Again, we use the quadratic formula :
Calculate the discriminant:
Now, solve for :
This gives us two possible solutions:
(Not physically meaningful as time cannot be negative)
So, the cannonball will hit the ground after approximately 14.3 seconds.
Summary
- Time to reach 426 feet:
- seconds
- seconds
- Time to hit the ground:
- seconds
Would you like details or have any questions?
Here are some more questions you might want to ask:
- How do you use the quadratic formula to solve equations?
- What does the discriminant tell us about the solutions to a quadratic equation?
- How do you interpret the physical meaning of negative time solutions?
- Can you explain the process of solving quadratic equations step by step?
- How do you determine when a projectile reaches its maximum height?
Tip: Always check the physical context of the problem when interpreting solutions to quadratic equations, especially when dealing with time.
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Math Problem Analysis
Mathematical Concepts
Quadratic Equations
Projectile Motion
Formulas
Quadratic formula
Theorems
-
Suitable Grade Level
High School
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