Answer:
<h2>441 J</h2>
Explanation:
The potential energy of a body can be found by using the formula
PE = mgh
where
m is the mass
h is the height
g is the acceleration due to gravity which is 9.8 m/s²
From the question we have
PE = 30 × 9.8 × 1.5
We have the final answer as
<h3>441 J</h3>
Hope this helps you
 
        
             
        
        
        
These forces form a force pair. Use Newton's third law, and you see that the trailer pulls back at with the same force. The answer is d.
        
                    
             
        
        
        
Answer:
her displacement <em>s=337.5m</em>
Explanation:
check out the above attachment ☝️
 
        
                    
             
        
        
        
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) = 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) = change of altitude (m)
<h3>Problem Solving</h3>
We know that :
- F = force = 100 N
 = change of altitude 300 m = 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>