Math Problem Statement

A ball is kicked into the air. Its height is modeled by the function h(t) = -5t^2 + 3t + 65, where h is the height of the object in meters and t is the time in seconds. Estimate the instantaneous rate of change in the ball’s height at 3 s.

Solution

The problem asks to estimate the instantaneous rate of change in the ball's height at t=3t = 3 seconds. The function describing the height h(t)h(t) is given as:

h(t)=5t2+3t+65h(t) = -5t^2 + 3t + 65

The instantaneous rate of change is the derivative of the height function h(t)h(t) with respect to time tt. Let's first find the derivative h(t)h'(t), and then evaluate it at t=3t = 3.

The derivative of h(t)=5t2+3t+65h(t) = -5t^2 + 3t + 65 is:

h(t)=ddt(5t2+3t+65)h'(t) = \frac{d}{dt} \left(-5t^2 + 3t + 65\right)

Calculating the derivative:

h(t)=10t+3h'(t) = -10t + 3

Now, substituting t=3t = 3 into the derivative:

h(3)=10(3)+3=30+3=27h'(3) = -10(3) + 3 = -30 + 3 = -27

Thus, the instantaneous rate of change in the ball's height at t=3t = 3 seconds is 27-27 meters per second.

This means the ball is falling at a rate of 27 meters per second at that moment.

Would you like more details or further clarifications?

Follow-up Questions:

  1. What does the negative sign in the instantaneous rate of change represent in this context?
  2. How do we interpret the meaning of the derivative in relation to real-world motion?
  3. How would the height of the ball change over time, given the function h(t)h(t)?
  4. What are the implications if h(t)=0h'(t) = 0 at a certain time?
  5. How would you compute the average rate of change between two different times?

Tip:

The derivative gives the instantaneous rate of change, which can be interpreted as the velocity of the object at a particular time in motion problems like this one.

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Math Problem Analysis

Mathematical Concepts

Differentiation
Instantaneous Rate of Change
Quadratic Functions

Formulas

h(t) = -5t^2 + 3t + 65
h'(t) = -10t + 3

Theorems

Derivative as the rate of change

Suitable Grade Level

Grade 11-12