The height (in meters) of a ballistic t seconds after being launched is modeled by the function h (t) = 60 + 80t - 5t2. Find the height, vertical velocity, and acceleration of the object after 10 seconds. Include units. If any of the numbers are negative, explain what that means in the real-world application.

Calculus: Early Transcendentals
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Author:James Stewart
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Chapter1: Functions And Models
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### Problem Statement

The height (in meters) of a ballistic \( t \) seconds after being launched is modeled by the function:

\[ h(t) = 60 + 80t - 5t^2 \]

Find the height, vertical velocity, and acceleration of the object after 10 seconds. Include units. If any of the numbers are negative, explain what that means in the real-world application.

### Solution Steps

1. **Height Calculation**:
   To find the height of the object at \( t = 10 \) seconds, substitute \( t \) with 10 in the height function \( h(t) \).

   \[
   h(10) = 60 + 80(10) - 5(10)^2 
          = 60 + 800 - 500 
          = 360 \text{ meters}
   \]

2. **Vertical Velocity Calculation**:
   The vertical velocity can be found by taking the derivative of the height function \( h(t) \) with respect to time \( t \).

   \[
   v(t) = \frac{dh(t)}{dt} = 80 - 10t
   \]

   Now, substitute \( t \) with 10:

   \[
   v(10) = 80 - 10(10)
          = 80 - 100
          = -20 \text{ meters per second}
   \]

3. **Acceleration Calculation**:
   The acceleration is the derivative of the velocity function (which corresponds to the second derivative of the height function).

   \[
   a(t) = \frac{dv(t)}{dt} = -10 \text{ meters per second squared}
   \]

### Interpretation of Negative Values

- The **negative velocity** of \(-20\) meters per second at \( t = 10 \) seconds indicates that the object is moving downward at that instant.
- The **constant negative acceleration** of \(-10\) meters per second squared represents the effect of gravity acting on the object, causing it to decelerate while going up and accelerate while coming down. 

### Summary

After 10 seconds:
- The height of the object is 360 meters.
- The vertical velocity of the object is \(-20\) meters per second (moving downward).
- The acceleration due to gravity is \(-10\) meters per second squared.
Transcribed Image Text:### Problem Statement The height (in meters) of a ballistic \( t \) seconds after being launched is modeled by the function: \[ h(t) = 60 + 80t - 5t^2 \] Find the height, vertical velocity, and acceleration of the object after 10 seconds. Include units. If any of the numbers are negative, explain what that means in the real-world application. ### Solution Steps 1. **Height Calculation**: To find the height of the object at \( t = 10 \) seconds, substitute \( t \) with 10 in the height function \( h(t) \). \[ h(10) = 60 + 80(10) - 5(10)^2 = 60 + 800 - 500 = 360 \text{ meters} \] 2. **Vertical Velocity Calculation**: The vertical velocity can be found by taking the derivative of the height function \( h(t) \) with respect to time \( t \). \[ v(t) = \frac{dh(t)}{dt} = 80 - 10t \] Now, substitute \( t \) with 10: \[ v(10) = 80 - 10(10) = 80 - 100 = -20 \text{ meters per second} \] 3. **Acceleration Calculation**: The acceleration is the derivative of the velocity function (which corresponds to the second derivative of the height function). \[ a(t) = \frac{dv(t)}{dt} = -10 \text{ meters per second squared} \] ### Interpretation of Negative Values - The **negative velocity** of \(-20\) meters per second at \( t = 10 \) seconds indicates that the object is moving downward at that instant. - The **constant negative acceleration** of \(-10\) meters per second squared represents the effect of gravity acting on the object, causing it to decelerate while going up and accelerate while coming down. ### Summary After 10 seconds: - The height of the object is 360 meters. - The vertical velocity of the object is \(-20\) meters per second (moving downward). - The acceleration due to gravity is \(-10\) meters per second squared.
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