Answer:
 250N
Explanation:
Given parameters: 
Time  = 4s 
Momentum  = 1000kgm/s
Unknown: 
Force  = ? 
Solution: 
To solve this problem, we use Newton's second law of motion; 
       Ft  = Momentum 
F is the force 
t is the time 
So; 
           F x 4 = 1000kgm/s 
           F  = 250N
 
        
             
        
        
        
A hypothesis is an educated guess. It's your own opinion!
        
             
        
        
        
The energy added here is potential energy since it is moving upward 180 meters in a gravitational field.  This is then turned into KE when it rolls down.  2524N x 180m = 454,320J
        
                    
             
        
        
        
I believe it is acceleration!