Answer:Distance and time
Explanation:
We know that average speed is the ratio of distance traveled by the particle over the time taken
So average velocity of balloon is
[tex]v_{avg}=\frac{\text{Distance}}{\text{Time taken}}[/tex]
So, Josh should note the distance traveled by balloon and time taken in doing so.
The two measurements required by Josh to calculate the average speed of the helium-filled balloon are distance and time.
The average speed of an object signifies and explains the total distance an object travels within a specified time. The average speed is a scalar quantity since it doesn't have a definite direction.
The average speed can be estimated if the measurement of the distance and time is being known because of its formula:
[tex]\mathsf{v_{avg} = \dfrac{distance}{time}}[/tex]
Learn more about average speed here:
https://brainly.com/question/12322912?referrer=searchResults
