I don’t think I’m right but I want to say 500 m/s
        
                    
             
        
        
        
Answer:
23.52092 J
Explanation:
m = Mass of block = 6.79 kg
s = Sliding distance = 2.82 m
 = Angle of slide = 20.7°
 = Angle of slide = 20.7°
 = Coefficient of kinetic friction = 0.425
 = Coefficient of kinetic friction = 0.425
g = Acceleration due to gravity = 9.8 m/s²
Work done by the force of gravity is given by

The work done by the force of gravity is 23.52092 J
 
        
             
        
        
        
PE= 3kg x 10N/kg x 10m
= 300J
        
             
        
        
        
Answer:
The steps are outlined in the explanation below. 
Explanation:
The average velocity is derived midpoint from the initial to the final velocity. Here is the proof:
Find the total displacement: 
let the displacement be given by the letter s
Then since the average velocity is defined as:  
where t = final time
            t₀ = initial time
            v = final speed
            v₀ = initial time
where x denotes the position, then

where v =  and dx = change in distance with respect to time.
 and dx = change in distance with respect to time. 
 
        
             
        
        
        
Acceleration because it is at a rise in speed. The formula for acceleration is Speed/Time.