Math Problem Statement

We are standing on the top of a 624 feet tall building and launch a small object upward. The object's vertical position, measured in feet, after t seconds is h(t)=-16t^2+160t+624.   What is the highest point that the object reaches?

Solution

The problem involves finding the highest point (maximum height) that the object reaches after being launched. The height of the object as a function of time is given by the quadratic equation:

h(t)=16t2+160t+624h(t) = -16t^2 + 160t + 624

This is a quadratic equation in the form h(t)=at2+bt+ch(t) = at^2 + bt + c, where:

  • a=16a = -16
  • b=160b = 160
  • c=624c = 624

Step 1: Find the time at which the object reaches its maximum height.

The maximum (or minimum) of a quadratic function h(t)=at2+bt+ch(t) = at^2 + bt + c occurs at the time tt given by the formula:

tmax=b2at_{\text{max}} = \frac{-b}{2a}

Substitute the values for aa and bb:

tmax=1602(16)=16032=5secondst_{\text{max}} = \frac{-160}{2(-16)} = \frac{-160}{-32} = 5 \, \text{seconds}

Step 2: Find the maximum height by substituting t=5t = 5 into the height equation.

h(5)=16(5)2+160(5)+624h(5) = -16(5)^2 + 160(5) + 624

First, calculate each term:

16(5)2=16(25)=400-16(5)^2 = -16(25) = -400 160(5)=800160(5) = 800

Now substitute:

h(5)=400+800+624=1024feeth(5) = -400 + 800 + 624 = 1024 \, \text{feet}

Conclusion:

The highest point that the object reaches is 1024 feet.

Would you like more details or have any questions?

Here are some related questions you can explore:

  1. How do you determine the time at which an object reaches the highest or lowest point in a quadratic function?
  2. What would happen if the object's initial velocity were different, and how would that change the height reached?
  3. How can we calculate the time it takes for the object to return to the ground (when h(t)=0h(t) = 0)?
  4. How does the negative coefficient in front of t2t^2 affect the graph of the height function?
  5. Can you derive the formula for the maximum height of any object launched vertically, using a similar equation?

Tip: Quadratic equations with negative coefficients for t2t^2 always have a downward-facing parabola, meaning they reach a maximum at the vertex.

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Math Problem Analysis

Mathematical Concepts

Algebra
Quadratic Equations
Projectile Motion

Formulas

h(t) = -16t^2 + 160t + 624
t_max = -b/(2a)

Theorems

Vertex of a Parabola

Suitable Grade Level

Grades 9-12