Answer:
weight
Explanation:
weight is the pull of gravity so its a force !!
C. a lack of accurate results
hope this helps
Answer:
Look to the explanation
Explanation:
<u><em>Average velocity:</em></u> is the average rate of change of displacement with
respect to time
Average velocity is a measure for distance traveled in a given time
We can calculate the average velocity by the rule 
where s is the displacement and t is the time
<u><em>Instantaneous velocity:</em></u> is the velocity of an object in motion at a
specific point (x , t)
instantaneous velocity is the limit of velocity as the change in time
approaches zero
We can calculate the instantaneous velocity by the rule 
<u>Average velocity</u> is <u>equal</u> to the <u>instantaneous velocity</u> when
<u>acceleration</u> is <u>zero</u>
Answer:

Explanation:
<u>Rate Of Change</u>
Let some variable y depend on time t. we can express y as a function of t as

The instant rate of change of y respect to t is the first derivative, i.e.

The balloon, the ground and the observer form a right triangle (shown below) where the height of the balloon y, the horizontal distance x, and the angle of elevation are related with the trigonometric formula

Since x is constant, we take the derivative with respect to time by using the chain rule:

Solving for 

Let's compute the actual angle with the initial conditions y=9 feet, x=12 feet


Knowing that



The balloon is rising at y'=8 feet/sec, thus we compute the change of the angle of elevation:


