Answer:

Explanation:
m = Mass of object = 
mg = Weight of object = 20 N
g = Acceleration due to gravity = 
v = Final velocity = 15 m/s
u = Initial velocity = 0
d = Distance moved by the object = 150 m
 = Angle of slope =
 = Angle of slope = 
f = Force of friction
fd = Work done against friction
The force balance of the system is

The work done against friction is  .
.
 
        
             
        
        
        
Answer:
Force on the object is 20 N
Explanation:
As we know that work done to raise the book from initial position to final position is known as potential energy stored in it
So here we know that

here we know that
U = 30 J
s = displacement = 1.5 m
so we have


 
        
             
        
        
        
2.4 meters per second
I hope this helps
        
                    
             
        
        
        
Answer:
Explanation:
The work increased the potential energy
W = PE = mgh = 40(9.8)(15) = 5880 J(oules)