Josh has a helium-filled balloon. He wants to calculate the speed of his balloon as it rises to the ceiling. What two measurements should he take to calculate the average speed of his balloon?

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:

Learn more about average speed here:

link

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

So, Josh should note the distance traveled by balloon and time taken in doing  so.

this means that the temperature of both substances will be equal

d. air pressure decreases as altitude increases.