So, the work was done by that hot air-balloon is <u>30,000 J or 30 kJ</u>.
<h3>Introduction</h3>
Hi ! In this question, I will help you. <u>Work is the amount of force exerted to cause an object to move a certain distance from its starting point</u>. In physics, the amount of work will be proportional to the increase in force and increase in displacement. Amount of work can be calculated by this equation :

With the following condition :
- W = work (J)
- F = force (N)
- s = shift or displacement (m)
Now, the s (displacement) can be written as ∆h (altitude change) because the object move to vertical line. The formula can also be changed to:

With the following condition :
- W = work (J)
- F = force (N)
= change of altitude (m)
If an object has mass, then the object will also be affected by gravity. Always remember that F = m × g. So that :


With the following condition :
- W = work (J)
- m = mass of the object (kg)
- g = acceleration of the gravity (m/s²)
= change of altitude (m)
<h3>Problem Solving</h3>
We know that :
- F = force = 100 N
= change of altitude 300 m
What was asked :
Step by step :



<h3>Conclusion</h3>
So, the work was done by that hot air-balloon is 30,000 J or 30 kJ.
<h3>See More :</h3>
Explanation:
a. Average speed = distance / time
= 100 m / 70 s
= 1.43 m/s
b. Average displacement = displacement / time
= 0 m / 70 s
= 0 m/s
Distance is the length of the path traveled. Displacement is the difference between the final position and initial position.
The time taken for Train A to be 39.1 miles ahead of Train B is 2.7 hours
<h3>How to determine the relative speed</h3>
- Speed of Train A = 41.1 mph
- Speed of Train B = 26.5 mph
- Relative speed =?
Relative speed = 41.1 - 26.5
Relative speed = 14.6 mph
<h3>How to determine the time to be 39.1 miles apart</h3>
- Relative speed = 14.6 mph
- Distance = 39.1 miles
- Time =?
Relative speed = distance / time
14.6 = 39.1 / time
Cross multiply
14.6 × time = 39.1
Divide both side by 14.6
Time = 39.1 / 14.6
Time = 2.7 hours
Thus, it will take train A 2.7 hours to be 39.1 miles ahead of Train B
Learn more about speed:
brainly.com/question/14334174
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