# Calculus 3 : Integration

## Example Questions

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### Example Question #1 : Integration

Function  gives the velocity of a particle as a function of time.

Find the equation that models the particle's postion as a function of time.

Explanation:

Recall that velocity is the first derivative of position, and acceleration is the second derivative of position. We begin with velocity, so we need to integrate to find position and derive to find acceleration.

We are starting with the following

We need to perform the following:

Recall that to integrate, we add one to each exponent and divide by the that number, so we get the following. Don't forget your +c as well.

Which makes our position function, h(t), the following:

### Example Question #2 : Integration

Consider the velocity function modeled in meters per second by v(t).

Find the position of a particle whose velocity is modeled by  after  seconds.

Explanation:

Recall that velocity is the first derivative of position, so to find the position function we need to integrate .

Becomes,

Then, we need to find

### Example Question #3 : Integration

Find the position function given the velocity function:

Explanation:

To find the position from the velocity function, integrate

by increasing the exponent of each t term and then dividing that term by the new exponent value.

### Example Question #4 : Integration

Consider the velocity function given by

Find the position of a particle after  seconds if its velocity can be modeled by  and the graph of its position function passes through the point .

Explanation:

Recall that velocity is the first derivative of position and acceleration is the second derivative of position. Therfore, we need to integrate v(t) to find p(t)

So we get:

What we ultimately need is p(5), but first we need to find c: Use the point (2,2)

So our position function is:

### Example Question #5 : Integration

The velocity equation of an object is given by the equation . What is the position of the object at time  if the initial position of the object is ?

Explanation:

The position of the object can be found by integrating the velocity equation and solving for . To integrate the velocity equation we first rewrite the equation.

To integrate this equation we must use the power rule where,

.

Applying this to the velocity equation gives us,

.

We must solve for the value of  by using the initial position of the object.

Therefore,  and .

### Example Question #6 : Integration

The acceleration of an object is given by the equation . What is the equation for the position of the object, if the object has an initial velocity of  and an initial position of ?

Explanation:

To find the position of the object we must use the power rule to integrate the acceleration equation twice. The power rule is such that

Therefore integrating the acceleration equation gives us

We can solve for the value of  by using the initial velocity of the object.

Therefore  and

To find the position of the object we integrate the velocity equation.

We can solve for this new value of  by using the object's initial position

Therefore  and

### Example Question #7 : Integration

The velocity of an object is given by the equation . What is the position of the object at time  if the object has a position of  and time ?

Explanation:

To find the position of the object we must first find the position equation of the object. The position equation can be found by integrating the velocity equation. This can be done using the power rule where if

Using this rule we find that

Using the position of the object at time  we can solve for

Therefore  and

We can now find the position at time .

### Example Question #8 : Integration

The velocity of an object is . What is the position of the object if its initial position is ?

Explanation:

The position is the integral of the velocity. By integrating with the power rule we can find the object's position.

The power rule is where

.

Therefore the position of the object is

.

We can solve for the constant  using the object's initial position.

Therefore  and .

### Example Question #9 : Integration

If the velocity function of a car is , what is the position when ?

Explanation:

To find the position from the velocity function, take the integral of the velocity function.

Substitute .

### Example Question #67 : How To Find Position

If the velocity of a particle is , and its position at  is , what is its position at ?

Explanation:

This problem can be done using the fundamental theorem of calculus. We hvae

where  is the position at time . So we have

so we need to solve for :

So then the position at  is

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