Math Problem Statement

A rocket is launched from a tower. The height of the rocket, y in feet, is related to the time after launch, x in seconds, by the given equation. Using this equation, find the maximum height reached by the rocket, to the nearest tenth of a foot. y=−16x 2+124x+110

Solution

To find the maximum height of the rocket, we use the given quadratic equation:

y=16x2+124x+110y = -16x^2 + 124x + 110

This is a parabola opening downwards because the coefficient of x2x^2 is negative (16-16). The maximum height is achieved at the vertex of the parabola.

Step 1: Formula for the vertex

The time at which the maximum height occurs is given by:

x=b2ax = -\frac{b}{2a}

Here, a=16a = -16, b=124b = 124, and c=110c = 110.

x=1242(16)=12432=3.875seconds.x = -\frac{124}{2(-16)} = \frac{124}{32} = 3.875 \, \text{seconds}.

Step 2: Calculate maximum height

Substitute x=3.875x = 3.875 into the equation to find the maximum height yy:

y=16(3.875)2+124(3.875)+110y = -16(3.875)^2 + 124(3.875) + 110

First, calculate each term: (3.875)2=15.015625,16(15.015625)=240.25,124(3.875)=480.5(3.875)^2 = 15.015625, \quad -16(15.015625) = -240.25, \quad 124(3.875) = 480.5

y=240.25+480.5+110=350.25feet.y = -240.25 + 480.5 + 110 = 350.25 \, \text{feet}.

Final Answer:

The maximum height of the rocket is 350.3 feet (to the nearest tenth).


Would you like a detailed explanation of any part of the process?

Related Questions:

  1. How do you find the vertex of a quadratic equation in general?
  2. What is the significance of the sign of the aa term in the quadratic equation?
  3. Can you calculate the time the rocket takes to hit the ground using this equation?
  4. How does the initial velocity affect the trajectory of the rocket?
  5. What is the physical interpretation of the constant term 110 in the equation?

Tip: The vertex formula is a crucial tool for finding the maximum or minimum value of a quadratic function in applications like projectile motion.

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Math Problem Analysis

Mathematical Concepts

Quadratic Equations
Projectile Motion
Parabolas

Formulas

Vertex formula x = -b / (2a)
Quadratic equation y = ax^2 + bx + c

Theorems

Vertex Theorem for Quadratic Equations

Suitable Grade Level

Grades 9-12